Pagelines Platform, trouble changing header font

I’m trying to change the font for my headers in the Pagelines Settings / Typography section, but no changes are taking effect. I currently have it set for Verdana but the site displays a serif font. I can change the other fonts (primary, secondary, etc) just fine, but for some reason the headers don’t work.

It’s possible that I set something a long time ago in the .css file but I’ve searched it and can’t find anything relating to header fonts.

http://newverselessons.com/