The site is not displayed correctly

Hello, in my forum (ipb forum version 3.0.4) located at forum-m.ru, all style rules worked with http, the login and registration page adapted to mobile devices. After switching to https and connecting the site to cloudflare.com, some style rules stopped working and the above pages stopped adapting. Why is this happening and how to fix it?

That would normally indicate a Mixed Content problem, but I’m not seeing that.

problem still exists

I fixed the links in the code, the same thing, maybe something else?

Since I can’t replicate the problem, I can’t offer any other suggestions.

Browser Dev Tools (F12 on Chrome) will open up a window in your browser where you can look at Network resources for connections, and Console for errors.