WordPress MP6 registers Google fonts apart from my theme

My theme (customized theme Esplanade on www.maartenvandekamp.nl) uses Google fonts. These fonts are registered and enqueued the right way in functions.php. The new (secret!) plugin MP6 also uses Google fonts, but does not check if a user is logged in, so these fonts are always enqueued when a post of page is viewed, even when I’m …