I realized one folder from my collection, “General”, on the Android version, is missing. And it happens to contain a number, according to my iPad at least, that would bring the Android unread count to the same as desktop and iPad.
Force stopped, cleared cache and storage data and uninstalled. I then reinstalled, it automatically had me logged in still and everything settings wise was still set (dark mode, font size etc)
I repeated the steps and did a full shut down and restart. No resolution.