Brand new Eufy 30c drops a trail of dust on the carpet!
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A little bit of dirt is good for health. 
Although I don’t have a robovac, I’ve seen this problem with a lot of vacuums in general. It sucks because I’ve never once been able to fix it 
and always had to either return it or get a new one.
I think I figured out what went wrong. Apparently the robot does not work great on office chair underlay (and I tested this by scattering small amounts of dirt for it to pick up). It failed miserably. It had to run over the same area 5 times before it sucked it up, and it STILL left dirt behind. Something weird is going on with the robot and the surface of the underlay. I even set it to max suction, it still would not bite.
There are different types
One is smooth plastic, others are kind of carpet.
I have both types of floor in my flat.
But never have seen that issue.