So apparently it is because of some code that a designer added before - but now that designer is no longer around. Anyone good at code?!
Happy to help you with this! It seems that the code you’ve added to the Design -> Custom CSS panel is causing this issue on your site. Troubleshooting code falls outside our scope of support, so we can’t pinpoint the exact issue with the code. However, when I copy and pasted the code onto a test site, I was able to replicate the same issue there. This indicates that the code is causing or contributing to the issue on your site. While we can’t help out with this further, I’d recommend consulting the Squarespace Forum community for guidance: