diff --git a/app/src/molecules/LegacyModal/LegacyModalShell.tsx b/app/src/molecules/LegacyModal/LegacyModalShell.tsx
index 9142ea14cbf..10d8faca6a4 100644
--- a/app/src/molecules/LegacyModal/LegacyModalShell.tsx
+++ b/app/src/molecules/LegacyModal/LegacyModalShell.tsx
@@ -3,7 +3,6 @@ import styled from 'styled-components'
 import {
   StyleProps,
   COLORS,
-  POSITION_FIXED,
   POSITION_ABSOLUTE,
   ALIGN_CENTER,
   JUSTIFY_CENTER,
@@ -76,7 +75,7 @@ export function LegacyModalShell(props: LegacyModalShellProps): JSX.Element {
 }
 
 const Overlay = styled.div`
-  position: ${POSITION_FIXED};
+  position: ${POSITION_ABSOLUTE};
   left: 0;
   right: 0;
   top: 0;
diff --git a/app/src/organisms/Devices/RobotSettings/UpdateBuildroot/ViewUpdateModal.tsx b/app/src/organisms/Devices/RobotSettings/UpdateBuildroot/ViewUpdateModal.tsx
index ea8435ab8bb..37e4177db0d 100644
--- a/app/src/organisms/Devices/RobotSettings/UpdateBuildroot/ViewUpdateModal.tsx
+++ b/app/src/organisms/Devices/RobotSettings/UpdateBuildroot/ViewUpdateModal.tsx
@@ -10,7 +10,7 @@ import {
   getRobotUpdateAvailable,
 } from '../../../../redux/robot-update'
 import { getAvailableShellUpdate } from '../../../../redux/shell'
-import { getModalPortalEl } from '../../../../App/portal'
+import { getTopPortalEl } from '../../../../App/portal'
 import { UpdateAppModal } from '../../../../organisms/UpdateAppModal'
 import { MigrationWarningModal } from './MigrationWarningModal'
 import { UpdateRobotModal } from './UpdateRobotModal'
@@ -60,7 +60,7 @@ export function ViewUpdateModal(
   if (availableAppUpdateVersion && showAppUpdateModal)
     return createPortal(
       <UpdateAppModal closeModal={() => setShowAppUpdateModal(false)} />,
-      getModalPortalEl()
+      getTopPortalEl()
     )
 
   if (showMigrationWarning) {
diff --git a/app/src/organisms/RunDetails/ConfirmCancelModal.tsx b/app/src/organisms/RunDetails/ConfirmCancelModal.tsx
index 2e1b6b5238f..ba1ec7e738f 100644
--- a/app/src/organisms/RunDetails/ConfirmCancelModal.tsx
+++ b/app/src/organisms/RunDetails/ConfirmCancelModal.tsx
@@ -20,7 +20,7 @@ import {
 } from '@opentrons/api-client'
 import { useStopRunMutation } from '@opentrons/react-api-client'
 
-import { getModalPortalEl } from '../../App/portal'
+import { getTopPortalEl } from '../../App/portal'
 import { LegacyModal } from '../../molecules/LegacyModal'
 import { useTrackProtocolRunEvent, useIsFlex } from '../Devices/hooks'
 import { useRunStatus } from '../RunTimeControl/hooks'
@@ -108,6 +108,6 @@ export function ConfirmCancelModal(
         </Flex>
       </Flex>
     </LegacyModal>,
-    getModalPortalEl()
+    getTopPortalEl()
   )
 }