Hi! We've raised rabbits for close to 15 years now, and this has happened to us too.
The bottom line is that some rabbits can be raised together, and some can't. Just like people, they have their own temperaments, and some just prefer their own space. This is more common with does, who tend to be more territorial. We've successfully raised colonies of rabbits, but it seems like there's one in every bunch who wants her own apartment.
Andie has already given the advice I'd give ... first and foremost, more space. They might settle down if they have room to get away from each other. Make sure they don't feel like they have to compete for resources. Give them plenty of things to chew on so they're not tempted to chew on each other.
If that doesn't work, you will have to accept the fact that these girls just don't want to live together and either divide the hutch you have, or get separate housing for one of them.