Article fonts family & size can't change in mobile

I am using cloudways, i also disabled the Varnish on cloudways.

It seems working correctly now after disabling the cache :)
https://www.screencast.com/t/2oTD0T7Y

Hi Ying,
yes it worked. :) just noticed.
What could be the reason? conflict?
Should I have both the wp rocket and cloudflare cache enabled together?

I think that's just a cache issue, the old cache wasn't cleared.

According to WP Rocket, they can be used together:
https://wp-rocket.me/wp-rocket-and-cloudflare/

But I don't use WP Rocket myself, so I can't really share my experience on this one.

Thank you very much.

No problem :)