At some point did you change your Apple Account (formerly called Apple ID)? If yes, you are likely seeing this because you have apps you downloaded under the previous Apple Account and apps are forever tied to the Apple Account they were downloaded under. If this is your situation, you'll need to delete the apps which you downloaded under the old Apple Account and rebuy/re-download under the new Apple Account.
I copied this from a Google Search and have not tried the suggestions as I've never changed my Apple Account, but see if this helps:
"Methods to Identify Apps from Other Accounts
- Update Prompt Method: Open the App Store, tap your profile icon, and check for updates. When the device prompts for a password for a specific app, the email address shown in the prompt is the Apple ID that owns that app.
- Purchase History Comparison: Navigate to Settings > [Your Name] > Media & Purchases > View Account > Purchase History to see apps linked to your current ID. Compare this list against your installed apps; any app not appearing in your purchase history (and not shared via Family Sharing) likely belongs to a different account.
- iTunes/Mac Inspection: Connect your iPhone to a computer with iTunes (or Finder on macOS). Right-click an app in your library, select Get Info, and go to the File tab to see the "Purchased by" Apple ID.
- Backup Warning: Perform an iTunes/Finder backup; the process may warn you at the end about apps that cannot be backed up because they are not associated with the current Apple ID."
User level: Level 1 (4 points)
