Responsive problems with some banners

How are you adding the ad? The element you're adding center alignment to doesn't seem to be the parent of the actual ad in the header?

Hi,

I am adding the banner on a GP Hook before the content.

Can you post the code you're putting into GP Hooks into a pastebin and send me the link?: http://pastebin.com/

Tom,

Here it is: http://pastebin.com/HruYaMfr