Problems with my sig.

I don't know whats going on but there is something wrong with my sig. When I look at my sig in a post I have made on the forum it is cut off at the bottem
and I can't see the whole thing. I don't know if its just me or if everyone can see it. Also when I preview my sig before I finish it it looks normal but when I finish its half cut off. I swear I have seen bigger sigs then mine. So can anyone tell me whats going on and how o fix it?

Signature sizes are limited by whether or not you're a donor and what grade of donor you are. Anything too big clips.