Yeah, this is known and it's an engine bug, but I stumbled into it, because of stupidity ...
It is caused by books with many pages, I think when a book has more than 10 pages, those books cause inventory problems. The mod contains a lot of books with more than 10 pages.
There are different solutions to fix it, and a workaround once the game is started.
The workaround is to split up the book contents into many books that contain less pages. This does not work for games already started, so I never implemented it. (At least it requires some more or less complicated actions by the user if doable at all without risking game crashes.)
The workaround is to move the books out of the inventory (and out of any bag/backpack) and store them somewhere. This could be an empty barrel, crate or chest one deposits at an easily reachable place, or one puts them into the 'Paperwork Container' in the 'Cyseal Crafting Station'.
The tooltip bug only seems to occur when a container has many other items in it, so it should work with little problems to pick them up again only when needed, which is normally only when looking up crafting recipes.
If the inventory is not overly full - after selling stuff to traders - the display bug should not occur.
So my recommendation is:
- move the books to the paperwork container (that's what I did in my own playthrough since I hardly had anything else in it)
- only pick up the books you need when you need them - crafting - and put them back to the paperwork container afterwards
- only pick up the books after selling stuff because the bug appears when containers have many items inside (the main inventory is also a container in that sense)
If you can still see the tooltips of the books, using 'Send to Homestead' from the book's right click menu should automatically move the books to the Paperwork Container, so it should not be necessary to manually move it there. (You should see at least the first book's tooltip, I think the bug affects only stuff that comes after the 'triggering' book inside a container.)
After relocating the books, everything should work as normal.
Sorry for the inconvenience.
Things can go wrong if one blindly relies on some developer's patch notes ...