Sidebar issue

Hi WordPress Ad Widget Support
I am using this plugin on my website, however the ads seem to be askew, as in they are up against the page edge rather being aligned with the sidebar, at least in the desktop/tablet layout, but is ok in mobile phone layout.
Can you suggest anything to remedy
Any help greatly appreciated
Cheers
Garry
see the following as an example
http://www.sciencenewsbreak.com/2017/05/04/rare-deadly-melanomas-not-caused-sun/