Wrong Website Shows Up On Domain

When I go to somesite.com on my server, sometimes somesite2.com shows up instead. This happened after I changed the ip for several accounts. Last time it happened after I restored backups. I have checked the DNS zone entry, and I have tried restoring backup. Doesn't help.
This happened once before, and I just terminated the account, and set it up again. But, I am wondering if there is a simpler way.
This is no real problem, but I think there must be an explanation and a quickfix.
Thanks in advance for any assistance.

 

Update:
The only way I can fix this problem is to delete the dns zone, and add it back again. This is happening everytime I create a new account. Hopefully someone has some idea of the permanent fix.