Upfront CSS help

Hello,

This question is about this page: https://sites.bishopg.ac.uk/digistars/about/

There is something going on with the CSS or upfront settings that is causing an issue with this page (and the contacts page) where the name of the current page is not displayed in the top nav menu. Actually, it is displayed, but in the same colour as the background in that area so the name is invisible. On the other pages in the site, this is not occurring.

There have been a few people working on the site so we're not sure what setting might have been changed on those pages to cause this but we have all looked and can't find how to correct it anywhere. I'm attaching a screenshot that shows the issue and uses the browser dev tools to try to show where the issue is coming from.

Thanks,

Ben