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chain roll over

Jan 3, 2018
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my mtb is equipped with a bafang bbs02 1200w motor
shortening (1000km) I have placed a Shimano Deore XT CS-M770 Cassette 9-speed silver (Execution: 11-34 teeth), in front is a bling ring 52t
from the 3rd smallest rear sprocket the chain starts to roll over, I already have this from the beginning
a new shimano e-bike chain has just been placed, problem has only been more
when using the second smallest sprocket, the chain jumps constantly, with the smallest gear less, about 1 x per second, more when I put more power on it
my speed is then around 40 to 55 km / pu
what is wrong?