Dahua Speeddome Incompatible With Dahua NVR

So I bought this Dahua Speeddome because it seemed like a good deal.

I knew it wasn't POE compatible when I bought it, but it said it came with an external PS, so I figured ok. It says it works with 802.3.at, Poe +.

But, when I try to use it with my Dahua NVR with built in POE 802.3.af switch, it starts clicking and shaking etc, because it is drawing some but not enough power from the switch. It works fine if I use it with a non POE switch and its external PS, but I think it's stupid I can't use it with its own NVR.

Do you think this is a defect, or should I use both the external PS and let it draw whatever it wants off the switch?

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