Yes, its common for bonded buns to fight in new territories. Youll have to slow bond them in all areas they will be sharing

Can you keep one in the cage/pen and one free roaming your room for a little while, then swap them after a few hours? Itll allow both of them to get their smells around your room so it smells more like a shared territory than a completely neutral territory. You might have to do this a few times a day for a few days before you start to notice any differences. If that doesnt work after about 2 weeks, you can try stress bonding them inside of the room using a box or cat carrier

I’m not familiar with what you did in the beginning, but if I had this issue, I would try bathtub bonding, or whatever close proximity bonding you initially chose for the meantime. I’d wait to properly bond them till I’d moved into the permanent space. The good thing about that is it’s neutral territory. If you’re not planning on moving for a while, I would keep them in a smaller space till they make nice. I had a similar experience to you, and I had to go back to square one each time someone would try to hump and chase. Maybe free run time should also be reduced till they get along better. Mine got jealous if one had access to space that the other didn’t, because one would claim it and then the other would claim it also. You may run into that issue, but if you don’t, that’s a good sign. Mine still have the odd hump-and-groom tug of war every now and then.