Please leave some example URL to allow us to check the issue.
In case you want to say thank you! 🙂 We'd really appreciate if you leave a good review on the plugin page. This is the best way to say thank you to this project and the support team.
One of the active plugins or theme tries to load 2 comment sections for mobile and desktops. It adds {display:none} CSS role for the wpDiscuz textarea element. Thus, it is not being displayed (see the screenshot below).
Please deactivate the plugins one by one and find the plugin/theme that caused the issue. Once you find the problem maker (theme or plugin) contact them and ask to fix the issue.
In case you want to say thank you! 🙂 We'd really appreciate if you leave a good review on the plugin page. This is the best way to say thank you to this project and the support team.