This is common of rabbits. It is a territorial behavior. You should have success and rid this behavior by introducing the cats and bunies in a neutral room to each other where they have not been before. This may take a few meetings and days of living together. Rabbits do not tolerate invasions by other pets into their turf without a chase.

I can relate…I have 3 bunnies and 3 cats. My cats pretty much stay out of the living room during bunny playtime. For the most part, the buns ignore the cats but every once in a while, Olivia and Stormy will charge them and try to bite. Stormy likes to go after their tails. They seem to be jealous when I give the cats attention. But I don’t worry about it too much because the bunnies are only allowed free roam in the living room at certain times of the day and the cats can either stay away or stay up high during bunny time. For the most part though, it’s just bunnies and cats ignoring each other. I had one cat who would stand up to the bunnies and wack them with her paw when they got out of line but Stormy even kicked her out of the living room at times. She died recently and now the bunnies are in charge. Sorry I don’t have any advice I just wanted to share my similar experiences.

I have two rabbits and two cats as well and the rabbits are definitely in charge.  My femal rabbit (who dominates the male rabbit) is actually somewhat nice to the cats.  She will charge the cats, but only if they run while she is trying to sniff them out.  My male rabbit (who is totally submissive to my female) does not seem to tolerate the cats at all.  As soon as he realizes one is in his territory (the cats are curious so they try to go in there whenever they get a chance) he will charge at them and chase them out.  The cats know where to go to get away and they only interact when they are supervised.  I’ve been trying several months for them to get along, but the cats keep getting put in their place.