Strange shadow - UE5 mobile and stationary light

[Idknoidealol (bj6)]

Hey, I guess a picture will simply describe the issue by itself.

This is what I get in mobile preview (doesn’t happen otherwise) with a stationary directional light. When I switch to moveable light, the shadow looks correct. However, for other lighting problems, I would like to stay on stationary. Thanks

[ClockworkOcean]

I would say the lightmap of the floor is not high enough resolution. There’s not enough space to write good lines into the lightmap