Hey Katharina,
first of all, thank you for the purchase!
The problem most probably stems from the fact that the tag you’re talking about contains two words: please try visiting the “Icon Menu” tab of the Theme Options panel, expanding the icon menu item that corresponds to this element, and inserting a dash instead of space between the two words, i.e. “mixed-media”. Please let me know if this helps solve the issue!
Sincerely,
Andrii / Satori Studio