Since the last update to Premium 1.82 the gallery thumbnails no longer line up with the main image.
Also the description tan is no longer centered with a border line under it.
It is now on the left.
These issues are on the staging site.
I am using Version 1.7.8 on the main site and everything still looks great.
If I deactivate the premium plugin, the images line up.
GPP 1.8 introduced some changes – some users didn’t think the tabs looked ‘tabby’ enough and the thumbnails again didn’t work for a lot of sites so gutters were added. Try this CSS to revert it to your 1.7.8 site: