@Skandha thanks for helping me out! Allthough a bit late, I downloaded the update and now the borders and the fonts both work as expected.
Side note: When I tried to download the update in my wordpress Update Manager on the Dashboard, the update could not get installed, since the path was not available. Can you test that on your side? I now installed the update manually (downloaded it from the catchthemes website and inserted it into my folder manually), but if you require the error message, I can git checkout the previous version and show you the message.