Content is not loading in the content editor on the admin side. It is working in one location and not working in another location. Please check the below image of the content editor section.

Content is not loading in the content editor on the admin side. It is working in one location and not working in another location. Please check the below image of the content editor section.

There is a common error that occurs in the WordPress editor, where the text color is reset to white and the buttons needed to make changes on your editor in WordPress and its content go missing.
Simple options to fix the WordPress error
Clear the browser cache
To clear cache from your Chrome browser:
Open the browser and click on a button with three dots at the top right corner of the browser window.
Place the mouse pointer on ‘More tools’ and click on ‘Clear browsing data’.
Select a time range from the dropdown and click the ‘clear data’ button.
To clear cache from your Mozilla Firefox browser:
Open the browser and click on the menu button at the upper right corner.
Select Options from the menu.
In the Privacy section, click on Clear your recent history. From the drop-down menu next to a Time range to clear, select Everything, then click on Clear Now.
Hopefully, one of the above-mentioned solutions helped you fix WordPress issue and revert your text editor to its normal state. However, if you are still unable to fix it feel free to contact.