2 neutered male brothers rabbits fighting

HELP!

I have 2 Dutch neutered rabbits that have lived together since birth, 1yr old been neutered 7months and on Tuesday had a fight in the garden. I thought it may have been the presence of my third neutered male who they aren't bonded with, but while doing my morning check have found that they have had another fight overnight whilst in their hutch, and injured each other not just hair pulling. I really don't want to separate them as they are currently sitting grooming one another, and I don't have the space for a third hutch.

Help please!

Although the third male wasn't around, they might still have been upset about it. In which case they may settle down.
What sorts of injuries have they done each other?