Well, sorry my friend but I have no damn idea. Maybe making a fresh install if you added mods/plugins or whatever, but some bugs seems to happen to one person but no the next.
For exemple there is the Lingerie Skandhas, a relic that increase speed when clothes are broken...that for some reason locks me from moving when obtained except dash and jump, and block her mid-fall if she is downed, soft-locking the game.
A small tip I can give is, if you can still look into the inventory for item descriptions. You can buy the item, check the description in the inventory, and go back to menu to reload from the previous save if you don't like it, which will load right after entering the room and before buying the item.
Just don't leave the room before checking, since the game autosaves when you change room.