Sidebar is pushing down entry-content

I have created a CPT called “Practitioners”, and another called “Events”. When I display a practitioner listing, the sidebar has a right margin which pushes the content of the practitioner description down, and causes the profile tab to be displaced to the right. In the event listing I have been able to set the margins to zero and the problem doesn’t occur, but I can’t find the corresponding margin in the practitioner listing.

The CSS I have added to change the margins in the event:

.single-gd_event #gd-sidebar-wrapper,
.single-gd_event .geodir-details-sidebar-left,
.single-gd_event .geodir-sidebar-left,
.single-gd_event .geodir-details-sidebar-left {
margin-right: 0px; 
}

An event listing which “behaves”: http://hk-uk.co.uk/events/slough/hk-2/
A practitioner listing which doesn’t “behave”: http://hk-uk.co.uk/practitioners/nuneaton/eva-navarro/
I have attached a screenshot of the same practitioner page displayed after activating the Chrome developer tools, the orange area is the unwanted margin.

Which margin do I need to set to zero?

Many thanks!
John