I have the same issue.
Alright.. Thing is, I did the same thing: created a new world with the same seed and teleported to the coordinates, but I still found around 6 of them. Guess I was just lucky.
Nope, no mods. The seed is -8912100519932490673 and the coordinates of the area they were all found in are x: -250 y: 71 z: -644
No. This is a vanilla server downloaded directly from Mojang's website.
Nope.. All seven were found in the wild. (I never bred them.) I know it sorta looks like some of the rabbits are babies in the attached screenshot, but it's just the illusion of some of them jumping. Thanks for your input though.
Yes, all 7 were trying to attack me.
EDIT: Never mind, realized that this was intentional.
Here's the server log: note that I cut some of the "[Server thread/INFO]: [@: Score 0 is in range 0 to 0]" since it was redundant and unnecessary.