Ever since I updated to V12, the same cards keep showing up as due even right after doing them. I just did 500 cards today and I hit “good” on all of them (it says 23d) and they still showed up after I closed anki and opened it again. This was never an issue with V11 for me and only started after downloading ankihub.
Hello,
AnkiHub has no way of affecting scheduling, this might be due to another addon. Are you using custom study decks?