Disks getting same UniqueId

I am trying to create disk in Azure - US-East region and keep getting the same SCSI Unique Id for all my disks. Following is Get-Disk results and you can see that two of the virtual disks have the same UniqueId. I have tried creating additional new disks, but they show the same Id as well. Is there any issue with the controllers in Azure?

I believe it has something to do with the state of the Azure machine itself.

1. Initially I had data disk with cache enabled and then I changed it to None to create RAID. After that I changed the disks again as Cached and created RAID on it. After when I tried changing the disks again for creating a RAID over non-cached drives, I encountered issue where-in all the disks seem to be getting same unique id. This makes me believe this has something to do with state if the machine and it's scsi/disk controller.

2. One the machine reaches this state, I can create new data disk with read or read/write cache enabled that get a unique id and I can create RAID on top of them. However when I add disks with no disk cache, they all seem to be getting same unique id value.

3. Changing the read or read/write cache enabled disks to "None" cached disk changes their unique id to be non-unique as well. i.e 4D5346542020202000000000000000000000000000000000 . Looking for forums, I see this id appearing for anyone who has issues with unique id. Does this mean anything? 

Following is what I see on virtual machine:

PS C:\Users\XXXX> Get-PhysicalDisk | ft FriendlyName, Number, UniqueId, ObjectId, BusType –auto

FriendlyName  Number UniqueId
------------  ------ --------
PhysicalDisk0        IDE\DiskVirtual_HD______________________________1.1.0___\5&2d5f53a1&0&0.0.0:cs9800
PhysicalDisk1        IDE\DiskVirtual_HD______________________________1.1.0___\5&2d5f53a1&0&0.1.0:cs9800
PhysicalDisk5        4D5346542020202034D147C8F230954293BCBBD522D2DE70
PhysicalDisk3        4D5346542020202095E587A4D4F6E94D92AF662A23A4A6BF
PhysicalDisk4        4D534654202020204010517A7ABBF94BB6058591DDAAECAB
PhysicalDisk6        4D5346542020202000000000000000000000000000000000
PhysicalDisk2        4D5346542020202000000000000000000000000000000000
PhysicalDisk7        4D5346542020202000000000000000000000000000000000

Here, the last data three disks are in non-cached mode and the ones with valid unique id are in read-cache mode. Can you please suggest as this is hampering our performance testing for certain scenarios.

Thanks