I have two large stacks of crippling ointment in my inventory, which don’t merge together. But I don’t have any Magnifying Lenses, and haven’t seen any in a long time. (I’ve been doing a bunch of transmutation and I have 10+ of every other rare crafting material). I know there was some kind of Crippling Ointment related save bug a few versions ago. Were Magnifying Lenses accidentally turned into Crippling Ointment?
Magnification Lenses were removed from the game, so this is a side-effect of this change until I implement a new crafting material to replace it.