Chosen Sign-up form fonts not displaying

Hey, all — The fonts I chose for my sign-up form display correctly in the preview, but not in the live slide-in. I get this generic Times-like serif font, which isn’t even a theme font I use so it’s not my theme over-riding the MailPoet choices.

I searched the forums for a while, but didn’t find quite this problem. Anyone run into this and find a solution?

Thanks!

The page I need help with: [log in to see the link]