Right sidebar breaks only on mobile

Hi all,

My theme views as I want it to on desktop, but after the 4.3 update I noticed that the right sidebar is falling underneath the content section when I view on mobile, specifically when Disqus comments load and on the plot/creators/etc pages. I’ve messed around in developer to see if this was a padding or float issue, but nothing I seem to try works, and none of the content in the right sidebar is larger than the sidebar width, so that’s not the problem.

Why it breaks in mobile and not desktop is beyond me. Any help is truly appreciated!

http://finite-incantatem.com