Won't auto-capitalize personal pronoun 'I'

I have Smart Keyboard Pro v.4.21.0 on a Samsung A50 and also on my Samsung tablet. The tablet will automatically capitalize I (as in “I am”), but the phone will not. The auto capitalization box is checked in Settings. Any idea what’s wrong?

I’m using the same version on my LG V40 ThinQ with Android 9.0. I don’t have that issue. Since I don’t know your expertise, please forgive the suggestions you’ve tried.

  1. Clear the app’s cache and do a Force Stop.
  2. Clear your phone’s cache.
  3. Back up your settings, and libraries within the app. Uninstall the app, restart your phone, reinstall the app and import the saved settings back in.
    Start with #1 and proceed to each successive one. Good luck