Ok. Yeah that’s strange since you have two doing it. Only other thing I’d know would be a problem is with what they call the fly. I do know that the fly can stick if it’s too oily or greasy so you could try spraying something like brake cleaner or in some way degreasing it and try it again. I can’t give you any advice on taking the lock apart but the fly is tiny and easily lost. I’m not a fan of set triggers myself. Hope you figure it out though muzzleloading is fun in my opinion although sometimes it can be frustrating as you well know.