Line around discs

I have had the calipers off and replaced the seals cleaned and greased everything but now I have this line around the top of the disc which hasn't been there before. Any ideas of why? Or anything I could have done wrong?

Cheers

 

That's just wear mate.

Basically you pads are sitting inside that line

 

Cheers mate, haven't seen it before and thought I hadn't put it back together right