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Hi @istquai,

This is a conflict with other plugins or with the active theme.

1. Please deactivate plugins one by one and check after each deactivation

2. Switch to some default theme and check again

Please keep cache plugins deactivated during this testing process. 

Yes, I checked that there is a conflict with WP Rocket plugin. How can I fix it without disabling wprocket?

@istquai,

you just need to exclude wpDiscuz files from WP Rocket plugin settings:

• wpdiscuz.js
• wpdiscuz.css

This article should help you:

https://docs.wp-rocket.me/article/915-find-the-right-js-files-to-exclude-from-minification