Post configuration - how can I change it?

I have this strange configuration in my forum and search though I might (both here and there!) I can't seem to find out how to change it.

All the posts have this frame around them. Please, how the heck can I get rid of it? I've never seen it on any other XF forum!

text frame.JPG
Ah, I see what you mean. Yes we created our own skin - or at least our departing techy did! And we have a mobile skin.
I knew it was the link to XF but I couldn't remove the hyperlink! I just posted it to show which version we are on