Menu Resizing in gmedia pages.

i am using your plugin and i am realy happy with its simplicity and functionality. i am facing though a slight annoying issue. whenever i use my menu to navigate to one of the gmedia audio galleries i am using, the menu text resizes to a larger size and stays there. i am using wordpress along with the free version of sixteen theme. if i disable the gmedia plugin the menus work perfectly well. this is why i am addressing the issue to you hoping for a solution. i even tried removing some custom css that was simpy coloring the gallery red but the problem persists. the site is https://www.costasc.com/wp and you can see the problem when you click Action-Thriller under Projects. A prompt reply will be appreciated! thank you in advance.

p.s. it works fine on firefox so dont bother trying to replicate the problem there.
https://www.ads-software.com/plugins/grand-media/