diff --git a/src/ui/parcellationRegion/region.base.ts b/src/ui/parcellationRegion/region.base.ts
index 51ea824139a920943ebcc57f3b4a117da74c2129..473a830af001bb96e532fb38d2f516afb92390b7 100644
--- a/src/ui/parcellationRegion/region.base.ts
+++ b/src/ui/parcellationRegion/region.base.ts
@@ -90,19 +90,31 @@ export class RegionBase {
           const filteredRsInOtherTmpls = []
           for (const bundledObj of regionsInOtherTemplates) {
             const { template, parcellation, region } = bundledObj
-            const idx = filteredRsInOtherTmpls.findIndex(({ template: _template, region: _region }) => {
+
+            /**
+             * trying to find duplicate region
+             * with same templateId, and same hemisphere
+             */
+            const sameEntityIdx = filteredRsInOtherTmpls.findIndex(({ template: _template, region: _region }) => {
               return _template['@id'] === template['@id']
-                && getRegionHemisphere(_region) !== getRegionHemisphere(region)
+                && getRegionHemisphere(_region) === getRegionHemisphere(region)
             })
-            if ( idx < 0 ) {
+            /**
+             * if doesn't exist, just push to output
+             */
+            if ( sameEntityIdx < 0 ) {
               filteredRsInOtherTmpls.push(bundledObj)
             } else {
-              const { parcellation: currentParc } = filteredRsInOtherTmpls[idx]
+
+              /**
+               * if exists, only append the latest version
+               */
+              const { parcellation: currentParc } = filteredRsInOtherTmpls[sameEntityIdx]
               /**
                * if the new element is newer than existing item
                */
               if (isNewerThan(parcellations, parcellation, currentParc)) {
-                filteredRsInOtherTmpls.splice(idx, 1)
+                filteredRsInOtherTmpls.splice(sameEntityIdx, 1)
                 filteredRsInOtherTmpls.push(bundledObj)
               }
             }
diff --git a/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts b/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
index fceeb0c7046afe38195967825e12cbd82097dde2..3c7f395eece740396746c2e452f9f9061490736b 100644
--- a/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
+++ b/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
@@ -112,161 +112,5 @@ describe('> regionMenu.component.ts', () => {
       const fixture = TestBed.createComponent(RegionMenuComponent)
       expect(fixture).toBeTruthy()
     })
-    
-    describe('> regionInOtherTemplatesTmpl', () => {
-      beforeEach(() => {
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          viewerStateGetSelectedAtlas,
-          { parcellations: [] }
-        )
-      })
-
-      it('> if selector returns empty array, data-available-in-tmpl-count == 0', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          []
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        expect(toggleBtn.attributes['data-available-in-tmpl-count']).toEqual('0')
-      })
-
-      it('> if selector returns non empty array, data-available-in-tmpl-count == array.length', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        expect(toggleBtn.attributes['data-available-in-tmpl-count']).toEqual('2')
-      })
-
-      it('> if showRegionInOtherTmpl is set to false, toggle btn will not be shown', () => {
-        
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.componentInstance.showRegionInOtherTmpl = false
-        fixture.detectChanges()
-
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"]`) )
-        expect(toggleBtn).toBeFalsy()
-      })
-
-      it('> even if toggleBtn exists, list should be hidden by default', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-
-        const listContainer = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"]`) )
-        expect(listContainer).toBeFalsy()
-      })
-
-      it('> on click of toggle btn, list to become visible', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        toggleBtn.triggerEventHandler('click', null)
-        fixture.detectChanges()
-        const listContainer = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"]`) )
-        expect(listContainer).toBeTruthy()
-      })
-
-      it('> once list becomes available, there should be 2 items on the list', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        toggleBtn.triggerEventHandler('click', null)
-        fixture.detectChanges()
-        const listContainer = fixture.debugElement.queryAll( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"] [role="button"]`) )
-        expect(listContainer.length).toEqual(2)
-      })
-
-      it('> the text (no hemisphere metadata) on the list is as expected', () => {
-
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          nohemisphereHrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        toggleBtn.triggerEventHandler('click', null)
-        fixture.detectChanges()
-        const listContainer = fixture.debugElement.queryAll( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"] [role="button"]`) )
-
-        // trim white spaces before and after
-        
-        const texts = listContainer.map(c => c.nativeElement.textContent.replace(/^\s+/, '').replace(/\s+$/, ''))
-        expect(texts).toContain(mt0.name)
-        expect(texts).toContain(mt1.name)
-      })
-
-      it('> the text (with hemisphere metadata) on the list is as expected', () => {
-        
-        const mockStore = TestBed.inject(MockStore)
-        mockStore.overrideSelector(
-          regionInOtherTemplateSelector,
-          hemisphereMrms
-        )
-
-        const fixture = TestBed.createComponent(RegionMenuComponent)
-        fixture.componentInstance.region = mr1
-        fixture.detectChanges()
-        const toggleBtn = fixture.debugElement.query( By.css(`[aria-label="${ARIA_LABELS.AVAILABILITY_IN_OTHER_REF_SPACE}"]`) )
-        toggleBtn.triggerEventHandler('click', null)
-        fixture.detectChanges()
-        const listContainer = fixture.debugElement.queryAll( By.css(`[aria-label="${ARIA_LABELS.SHOW_IN_OTHER_REF_SPACE}"] [role="button"]`) )
-
-        // trim white spaces before and after, and middle white spaces into a single white space
-        const texts = listContainer.map(c => c.nativeElement.textContent.replace(/^\s+/, '').replace(/\s+$/, '').replace(/\s+/g, ' '))
-        expect(texts).toContain(`${mt0.name} (left hemisphere)`)
-        expect(texts).toContain(`${mt1.name} (left hemisphere)`)
-      })
-    })
   })
 })
\ No newline at end of file