I'd suggest you contact your hosting support. That sounds like it's a server configuration issue.
The domain mapping plugin does not have anything to do with what happens outside WordPress. Any time you see a cPanel page it is outside of WP.
I'd suggest you contact your hosting support. That sounds like it's a server configuration issue.
The domain mapping plugin does not have anything to do with what happens outside WordPress. Any time you see a cPanel page it is outside of WP.