Hey guys, looong time snake owner trying to get into breeding. Second season to attempt, no success yet. And I have a baffling situation I can't find any information on.

I have two males and two females (all of the sexes were 'sold to me as' and haven't been probed by me/my vet yet, and that'll be important in a second). My plan this year was to pair my BEL(m) to my spider(f), and my pinstripe(m) to my lesser(f). Pin is off feed and I felt follicles on my lesser, everyone is great age and weight so I felt ready to go and start pairing.
My spider female did this last season and is doing it again now, where she acts really aggressively immediately when the BEL (or the pin) is put in her cage. She'll shove at him, bridge her body, and act rather like two males fighting, though the BEL isn't fighting back at all and just continues to look interested in mating and tailwagging. Last year I only had her, and this led to me pulling the males early from her. She developed very clear, obvious follicles, ovulated, never laid anything. This year I put the BEL in, same problem.

The obvious first question is if my BEL and Spider were sold correctly sexed.
When I put the BEL with the pin, they both start acting like normal males, and when I put my BEL to the lesser (as they are right this moment) everything is calm and appears to be typical breeding introductions (the pin also was calm typical introduction with the lesser female). So the BEL seems to prove he is male.
When I put the pin to the spider, she acts the same aggressive way. She was sexed female by NERD, and like I said she had very clear signs last season. She's 4~years, near the 2,000 mark in weight.

I could bundle them all up and take them to the vet for the final probing, but the issue seems to be specifically with the spider and all signs point to female, save the aggression. So... has anyone been faced with a pissy female before?