New Deore M6000, piston leaking?

I've just fitted some brand new M6000 calipers from CRC as they seemed a good deal.
I've mounted connected and bled with Uberbike cables and RS505 shifters.
However, on the rear I've noticed a small sign of liquid, almost a small bubble, each time I squeeze the lever.
I tried to video it - look behind the far brake pad
https://imgur.com/a/zFGBS
Am I right in saying this is defective and should send it back? or is there a setup issue?
thanks for your help
I've mounted connected and bled with Uberbike cables and RS505 shifters.
However, on the rear I've noticed a small sign of liquid, almost a small bubble, each time I squeeze the lever.
I tried to video it - look behind the far brake pad
https://imgur.com/a/zFGBS
Am I right in saying this is defective and should send it back? or is there a setup issue?
thanks for your help
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I suggest removing the pads and drying up any fluid there, then retest. If brake fluid appears, then definitely faulty.