I can't see the description in Chrome or Firefox (except for the bit about payments). I would probably try switching to the HTML tab and removing everything from there just in case there's some code there that's causing it, then doing a plain text copy / paste in the Description builder tab, with font / colour edits done afterwards (best way to strip text of all embedded HTML is to copy it and paste it to something like notepad, then copy from notepad and paste to the description.