Is this normal?

[Squawkbox]

I have 3 rabbits. One I've had since she was 8 weeks or so and the others I caught in my skunk trap a while back. Anyways, my original rabbit started lactating about a month ago, and is still lactating (not pregnant, never has been). I checked the other 2 today and they are also lactating. This is my original rabbits second time going through this, it also happened last fall. I had/have to milk her or else she develops mastitis, and it appears same goes for these 2 as a few teats already have it.

Is this normal? A false pregnancy for rabbits... all 3 at the same time?