This explains it!

A doppelgänger is often perceived as a sinister form of bilocation and is regarded by some to be a harbinger of bad luck. In some traditions, a doppelgänger seen by a person's relative or friend portends illness or danger while seeing one's own doppelgänger is said to be an omen of death.

It's a bit of a downer! But there you go. Do you still have that pneumatic system? Which robot is it in?