Something in the thumbnails area of your site is causing portions of HTML on your site to be repeated. If you look at the raw HTML on the site, id's like "sclogin-remember" only appear once. However, if you open the Developer Tools in Chrome, go to the "Elements" section and search for "sclogin-remember", you'll see it's in there many times.
I don't know what Javascript on your site is working to repeat content in those thumbnails area, but you'll need to find and fix that. Other modules (a mod_custom showing a menu) is also being repeated, so it's not specific to the SCLogin module.
I hope that helps you narrow things down on where to start, but if you need anything else, please let us know.
Thanks,
Alex