Add this box hangs site

When you open the “more” items via the share button and scroll down, the site consistently hangs on reaching the items starting with letter S. I managed to get to the bottom of the list once, and it got stuck on the way back up.

Using the USM Plus plugin

Also, the icons on the share popup (before you click “More”) are all out of alignment with really ugly fonts. Any way to fix this without a huge hassle and !important declarations filling the stylesheet?