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Strange shadow

Anyone knows what makes this error??
Model is imported from sketchup, UE4.18, lightmass compress unticked, lightmap 4096(for all), built in medium, Epic quality.

World lightmass setting:
SLL: 0.25
NIL:20
NKL:7
IL:4
IL:1

MANY THANKS!

P.S. Whole model imported from sketchup, all uv are auto generate while imported