Custom code causing a weird pop up on my site

Hello,

This morning a weird pop-up saying "No reviews available" appeared on my website. Customer support said it is being caused by code on my website, but I haven't added any code recently.

Has this happened to anyone else? I'm not sure how to go about fixing it.

Thank you.

https://www.spectrumdesigns.org/

There is custom code on your site and it has syntax errors and errors, which might be a cause of your issue. Certainly the syntax errors should be fixed.