Wordpress Customizer NOT LOADING

I've had this issue before numerous times and almost every time it was an easy fix (disable plugins, find the perp &c).
Not this time though.

And that's not all, my site seems really broken atm.

My WordPress site has the following issues:
- Customizer does not load
- Elementor does not load
- Wordfence can't run scans
- Yoast SEO doesn't work at all

Here's what I've tried
- Disabling ALL plugins - doesn't change anything
- Changing themes - doesn't change anything
- Cleared browsing history &c - doesn't change anything

Here's what I've discovered
- Yoast SEO (latest version) doesn't work with my admin panel and messes up things even more but deactivating it doesn't fix my issue.

Other useful info
- PHP version 7.4.20
- WordPress version 5.7.2
- All plugins/themes updated

I've been scrolling the web and attempting things for the last couple of days but nothing seems to fix my issue.

Anyone who's had this issue? Any WordPress wizards?

Are all core WP files there?
Check plugins php dependencies (extensions and limits).
Also check site .htaccess file.

Are you using some CDN like CloudFlare or similar?

İt's look like cache or js problems mate. try different computer ?

Please add www. version to site URL setting of your backend of dashboard, sometimes this can cause weird problems like yours.

milk_and_cake said:

Are all core WP files there?
Check plugins php dependencies (extensions and limits).
Also check site .htaccess file.

Are you using some CDN like CloudFlare or similar?

Click to expand...

I'm using Cloudflare, forgot to mention that.
All core Core files are there and my .htaccess file seems fine.

munal said:

İt's look like cache or js problems mate. try different computer ?

Click to expand...

Already tried that, no difference.

terrycody said:

Please add www. version to site URL setting of your backend of dashboard, sometimes this can cause weird problems like yours.

Click to expand...

I'm already using the www version.

belg said:

Already tried that, no difference.

Click to expand...

Can you reach hosting? Did you check the log files? More detailed information about the error can be found there.

Update
I created a staging environment and guess what... The clone works perfectly, with no issues at all.

How is an exact clone of my website not having these issues?

Am I going mad?

What does your /var/log/apache2 / error.log say?

belg said:

Update
I created a staging environment and guess what... The clone works perfectly, with no issues at all.

How is an exact clone of my website not having these issues?

Am I going mad?

Click to expand...

same hosting / vps or different ?

munal said:

same hosting / vps or different ?

Click to expand...

Same host. I used the WP-Staging plugin to create the staging environment, so it just creates a clone from my website. Somehow this clone doesn't have any of the issues my actual site has.

My original site's WP panel doesn't even display the icons properly anymore. Below is a screenshot of the original vs the staging version of my site.

belg said:

Same host. I used the WP-Staging plugin to create the staging environment, so it just creates a clone from my website. Somehow this clone doesn't have any of the issues my actual site has.

My original site's WP panel doesn't even display the icons properly anymore. Below is a screenshot of the original vs the staging version of my site.
View attachment 176708

Click to expand...

2 options. Logs. Your web browser >right click > inspect. you send screenshot or upload your hosting's error log. Maybe we can help thay way. We're just guessing right now