DNS or HSPHERE issue?

Hey,

When I ping any of my customers mail servers like mail.clientdomain.com I always get back mail.hostingdomain.com or mail?.hostingdomain.com where ? is a number.

However for one client I am seeing mail5.m****here.biz.

Why is this? How do I fix it so it returns mail5.hostingdomain.com like the others do?
 
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