I have two rabbits of about 1 yr old, both males, one lionhead mixed and the other white rabbit, they have been living together in the cage and most of the times within the balcony area just fine, and they seem to love each other from young. They started to ride on each other since they are 5-6 months old but still very close to each other and groom each other.

Three weeks ago, We decided to bring them to the vet to get them both neutered to tone down their sexual aggressiveness and for better health, so they have just recovered from the surgery and back to normal. but one thing unusual happened was, they become gentle to me but very aggressive towards each other, whenever they are put together, they will fight like they going to kill each other, so we have no choice but to keep them both in separate cages.

Anyone has had the same problem before? they have never fought with each other before, we call them the gay couple but now they can't even get near to each other for more than 3 seconds. I thought neutering is suppose to make them more gentle and less territorial, but now is the other way round. Any idea what to do to improve the situation?