I can't see very well either, but to me, it looks like a normally drying bud. Buds look huge until you dry them, especially if they aren't fully finished flowering. The buds might look big, but when they dry, 80% or more of it is lost to water weight. As long as you aren't seeing mold, mildew, or other stuff like that, you are OK... just not nearly as big as you hoped.
Seriously... I'm not trying to be a dick, but you can expect to lose 80% of your weight when dried. If they don't fully finish, they can seem big and massive but most of the heft is grown at the end of flowering, and things can shrivel up a lot during drying. Was this the whole plant or a branch?