‘Our Focus’ section now missing from Customise

First of all, I love this theme, so thank you!

I have set up a site for a client, and when I first set it up was able to edit the Our Focus section in Appearance > Customize, so I’ve populated the section. However, some time in the last week or so, this has disappeared from the options I am able to customise! I am able to edit the 4 focus areas in Widgets, however can’t edit the content text anywhere.

The theme is at the latest version (updated today), as is WordPress, so I’m not sure what’s going on.