Hmm, I'm not sure why that's happening. It's not just your profile; I think it's doing that everywhere, and I just don't normally notice because I don't put lines around it so it's not as obvious.
I just tried editing the HTML, putting all the closing tags on one line in case that was somehow inserting a line break, but it didn't seem to make a difference.
EDIT: Nevermind, I fixed it! There was a line break between the closing includeonly tag and the opening noinclude tag! :)