Skill books at 100% without having read them

I recently started a new playthrough after not playing for half a year. I’m doing hardcore with numbskull and tapeworm trait. For the first time i noticed that even before i learned how to read, books in shop inventory (or my own) were at 100% progress. After learing how to read it was still the same.

I was unable to find topics with my issue so im asking now if anyone else encountered the same issue and if its related to numbkull trait. Skills are already hard enough to train this way and taking away my ability to gain xp through reading makes it quite a chore.

I just noticed that some potions formulas are available as well despite not making it before or buying a book to learn it’s recipe… This is really weird, it’s like this new playthrough is somehow mixed up with one of my previous ones. Anyone else had this bug before and/or knows how to fix it?