Well, I finished uninstalling the SEO mod. It seems I was mistaken. The issue exists even without the SEO mod installed. Thanks for all your help, I will look elsewhere to solve this last problem.
EDIT: If anyone has this problem, I found the solution. I had added the easing methods to highslide. I had set hs.easing in the overall header but didn't set hs.easingClose. After adding hs.easingClose to the header highslide configuration and setting it the issue was solved. Also, some of the easing equations seemed to cause this issue, like hs.easing='easeInBack';

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