Google fonts not showing in title

Hello,

I’m using the Sydney theme which got a built-in selection of google fonts.

The font that I select in the Sydney customizer for “Main-text” is used by waving portfolio for the move-over text of the fotos and for the description text in the box after you click on a foto. It is NOT used for the category buttons and for headline that shows in the box after clicking a foto. The “headline” font that I select in the customizer gets ignored by the plugin.

Is there a way to make the plugin change the headline that it uses in the pop-up-box? Ideally accepting the choice that I make in the customizer. And maybe also of the category buttons?

greets dosala