Conflict with Flatsome Theme

I have identified it is due to Generate UCSS. Can you tell how to avoid this while still enabling this option?

The problem is still there with Generate UCSS disabled on mobile devices as seen in the screenshot.

Incognito mode prevents to set cookies, but you have Guestmode enabled and Guestmode needs cookies, so disable incognito mode and everything should be fine again.

Never use incognito mode to check whatever at your page. It will always fail.

But then why the issue is still on pagepeedinsights. You can see the screenshot.

Because Pagespeed is incompatible with Guestmode because it doesn’t accept cookies, but you don’t have to worry about that. Your score isn’t influenced by this because your score is generated by real user data and not by Pagespeed. Chrome browser “phones home” and sends related data about performance of your page to Google.

So whenever you want to check your page at Pagespeed you must disable Guestmode.

Please read this to learn more about Guestmode:
https://blog.litespeedtech.com/2021/06/01/guest-mode-for-wordpress-in-lscwp-v4-0/

Yes, you are right. But still, there is a conflict with Generate UCSS. How to fix it? If I want to enable this option?

How to fix it?

A bit more details please. What is exactly wrong?

Frontend with Generate UCSS disabled and Generate UCSS enabled.

When is this https://snipboard.io/KwEWp2.jpg displayed and|or what do I have to do to see it?

Open this link. It is displayed when Generate UCSS is set to ON.

Okay, please read this:

https://blog.litespeedtech.com/2021/12/13/fix-incomplete-ucss/

There are so many differences, it is very difficult to compare the two pages. Any alternative or easy solution for it? or can you help in doing it?

if you have guest mode enabled already , you can just keep UCSS off for normal page.