Best guess: The Momageddon one was hastily put together for a joke at the end of the episode, but it wouldn't work well for a full episode, so they redesigned him again, kinda like Patrick's parents. Also, since Squidward's mother was redesigned in Momageddon, perhaps this is the husband of the old design.

I mean, they probably wanted to give him a more fun design since he's a prankster in Jeffy T's Prankwell Emporium