12 week old sisters? fighting

Hello there,
Not sure if I am posting this question in the right place as I am brand new to this site. I just wondered if anyone could offer me so much needed advice. I have 3 rabbit babies from the same litter - the vet has told me they are 3 girls. They are just 12 weeks old. in the last couple of days one of the rabbits began circling and started to chase the other one in circles then a fight ensued. I managed to separate them as fur was flying all over the place they went back together in their pen and then the next day the same thing happened again. We have now separated them but they can still see and sniff each other. I was wondering why this happened they have all been so happy living together! I'm thinking is one of them a boy and reaching maturity? The are no testicles.. yet? :? The third rabbit will not chase or circle with the other two she just seems submissive and doesn't want to fight. she is very calm and placid. I will be neutering them when they are old enough I just hope that they will be able to staying living together once this is done.
Any advice would be greatly appreciated.
Many Thanks.

The girls are at that age now where they will become hormonal and start to fight for territory. Girl buns can be notoriously catty. The best thing would be to separate them until they are neutered and then attempt to re-bond once their hormones have settled down.

Welcome to RU by the way

Welcome!! Nothing to add to the above advice, hope it all goes ok x

Sorry your bunnies have fallen out. I would check again to see if they are girls - it sounds more like you have 2 boys and 1 girl, the boys are fighting over the girl.