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If I would have to take a guess - they are about half a year old and puberty is in full swing? Also, with days getting longer, it's that time of the year too.
It's rather normal behaviour as they sort out their hierachy, in my opinion the important thing in this situation is that the way we keep them does not mess everything up. They need space, actually structured space with ways to get away from each other and stay out of sight if they feel like it. When they have a struggle for dominance and the loser can't leave the scene because they are in a cage without raceways (without dead ends) and hiding spots (not just a hidey house, but a part of their enclosure) that can be seen as affront and escalate things. Hidey houses need to be big enough and need to have 2 openings minimum.
They have escalation steps: evil eye, humping, shrort chase bursts and fur plucking from their behinds, serious chases and fights. In 10 years of keeping rabbits I've only seen does from different groups that got together accidentially actually give long chases and fight, not with ones that lived together. It can happen if the personalities absolutly don't match, can't tell how likely that is.
Currently I have 2 pairs of intact does, well, Red actually got spayed at age 7 due to an emergency, but that didn't really change anything. Each pair has two rather big, complete hutches, connected with a tunnel. If they feel like it they can avoid each other, mostly it's just Red (8) getting away from her super dominant mother Fury (11).
If you want to keep the does together I would not seperate if their environment can be adjusted (cardboard boxes do a reasonable well job) and if they don't actually fight. Rabbits aren't just the cuddly things we see, they can have very strong opinions about certain things.
Mine are all mother-daughter pairs, so things were a little easier for me.