The sewer has strange lighting. It has a 'window blinds' effect, straight lines drawn across surfaces the character.
The shadow depth bias for point lights is set too low. Set it from 0.02 to something like 0.05. I think 0.05 is often a default for new levels, but I don't really know that for sure.
Set it in the level properties in the project.
Or, in the in-game console, do
[ r.Shadow.PointLightDepthBias = 0.05 ]