Enchanting table doesn't remove its book on unload

Absolutely no idea why (maybe the rain), but as shown in the picture below, the enchanting table graphics seems to be broken or glitched. Was certainly normal during same game session, so it's changed since I've been playing - If that helps 😃 By the way, the picture is not just representative of one second, it is permanently like that, with the books on top rapidly shaking.