i see FOUC ( Flash of unstyled content ) when your site laods.
Initially it loads without any styles, and then it loads all your styles and that looks to be how you have set up your Litespeed caches. Check with Litespeed support on how to configure it correctly.
Yes, you are right. The CLS issue gets resolved without LiteSpeed. I had only disabled the cache earlier, but other settings may have affected the CLS issues.
However, now performance for mobile deteriorates. I will figure out the LiteSpeed settings.