I have provided the details needed.

I’ve also discovered that the above issue was not caused by Litespeed but rather my configuration of Asset Cleanup Pro, using /?wpacu_no_load fixes the issue from the screenshots above – however there is still a conflict with the Cart in Header as well as duplicated CSS code elsewhere on the page.

May I also please ask, with using the Layout Builder – is there any performance difference in page load time to using it instead of using default theme provided layout? i.e If you were to build 2 identical layouts that look exactly as the default one looks, would the page load faster or slower when using the Layout Builder option?

I’d like to try it – but if it increases page complexity or DOM output size then I’m not sure whether it would be worth using for the long term.