Strange shadows after building light

I’m new to Unreal and i have a problem with strange shadows showing. Example:


As You can see, the lght / shadow from the door opening should be continous, not cut in half like on this preview.
I use point lights inside the “house” and directional light outside. All set to stationary lights.

EDIT: When switching the directional light to “movable” everything looks ok. So why there is an option for stationary lights when one can’t use them due to bugs with shadows?