When you reply or do a quick reply it will sometimes leave a big space below the text. Any ideas why?

It doesnt matter how you do the post. It's because you have an avatar and other stuff on the left side it has to be at least as long as your left panel.

That makes sense.

Also if your Sig is Big, I try to keep it small no bigger than banners cause it get annoying to have hughe pics popping up constantly