RHEV 3.2 - Thin Provisioned Virtual Disks "expanding" when Live Migrated

I don't know if the condition I am witnessing is misreporting by RHEV, or a valid size.

I create a VM on one array that had a 50GB Thin Provisioned VD.
I then migrated to another array.

When I now review the VD, it indicates the Virtual Size is 50GB and the Actual Size is 53GB

Has anyone else seen this, or know what is going on here?

Thanks!