Sometimes, the DNS records can be set incorrectly (sometimes through migration from another host, and sometimes just human error!).

It is possible to entirely reset the DNS zone so that the domain has all records set back to the 'default' records provided by cPanel.

To do this, go to cPanel -> Domains -> Zone Editor

From here, select 'Manage' against the domain...

f15e515fac40b1e77a274e54ec6a81d90d4682b61583d9318c4df72980a563f088d32871a7e1a38c?t=ed9d0bd7907d8c15a558623d704296a2 Next, click 'Actions', then 'Reset DNS Zone'...