I would say if they are both now "fixed" and they weren't totally locked together - they would have gotten turned end to end - you shouldn't have anything to worry about.
Others are right about the hormone thing - takes time.
Just wondering if you ran any of this by your vet?
As for the humping, I have heard it is a sign of dominance. My female will hump my male - never the other way around! LOL
Yorkiesmiles