Main navigation & Buttons don't show local font on Safari

Hi,

I've been adding three custom fonts to the GeneratePress child theme. Two of them load perfectly across all browsers; Chrome, Firefox, Safari (haven't checked IE).

The only issue I'm seeing in Safari, where main navigation links and buttons don't load the right fonts no matter what I do. First I thought the local font wasn't added correctly but then when tested with both other two fonts that work or the Google font from the list the issue persisted.

For some reason, it seems like something breaks/ignores the font-family in main navigation links and buttons in Safari.

Does anybody have any clue what might be causing an issue?

Thanks!