Burn doing self damage

I was playing with the new Burn on my blaster & I found it now hurts me. It looks like I take the new initial damage but not the ticking damage. This damage is affected buy Build up & Aim too. It doesn't seem to happen every time but about 90% of the time. I was talking with a fire tank & his Burn wasn't hurting him so it might just be a blaster thing. I don't have any IO procs in there ether.
I was actually able to kill myself with it.