I swear I saw a thread for this already, and I know people have reported this before, but since I could not find a thread I figured I should make one.
The bug is quite simple: When making any cheese that requires sheep curd (blue cheese, manchego and emmental), the sheep curd is not used up. I have had 5 sheep curd for ages, and made multiple of each cheese, and I still have 5 sheep curd.
On another note, is it intentional that emmental requires sheep curd? Genuine emmental cheese uses cow milk, not sheep. Meanwhile, Feta Cheese, which always uses either sheep milk or a mix of sheep and goat, uses cow curd in the game. Is that an oversight or a deliberate choice for some reason?