I have seen other posts with this problem and I went through the relevant modules and set Prepare Content accordingly but still getting the same result.

On the home page it's in Custom modules.

I have used it in articles elsewhere on the website.

I thought that might be the case and removed the module. Didn't make any difference.

If I disable the 'System - Regular Labs Library' then everything works correctly. Not sure if that helps.

By the way, I do appreciate your help, thank you.