I did a fresh AAPANEL install and unfortunately I'm having some issues, apparently only on wordpress.
1) I can't upload, the following error occurs: Unexpected response from the server. The file may have been uploaded successfully. Check in the Media Library or reload the page.

2) I can't make changes to the template, the following error occurs: Looks like something’s gone wrong. Wait a couple seconds, and then try again. 
I've made several attempts to solve:
1) made more resources available for apache
2) I tested the nginx server
3) I configured https.
4) I changed the PHP version, , Among other attempts.
Strangely this problem is occurring only with wordpress sites.
I have joomla, nextcloud installed, and this kind of problem doesn't occur.
If someone can give me a light on how to solve this problem, I am grateful, I will provide access for verification.
http://194.163.189.211/
user: thiago
passwd: test123