Inconsistency between LUN ID's

I just added a few LUN's to our new EMC VNX, and the LUN ID's are not consistent..

Screenshot from EMC Unisphere

Screenshot from VMWare vSphere

If you study the two screenshots carefully, you'll notice that the Unique ID is identical, yet the LUN ID's differ. I'm a bit at a halt here, and I'm not sure if I should call EMC and blame them, or start searching the net for potential vSphere bugs..

Ok - I'm adding this in case of anyone else gets the same problem. It's a bit embarrassing that I didn't check this first.. :-)

EMC VNX (Clariion) uses a concept of Storage Groups to map LUN's to hosts. For some reason, you have to select what the Host ID LUN should be when you map it. One possible scenario could be sharing a LUN between several servers, where one of the LUN's could already be in use on one of the hosts.

Example: