Weird shadows


I am making a small environment in UE4 and I am having those weird shadows on the floor. Im trying to figure what is the problem if its the lightmaps or the lightmass in the world properties setting but still giving me this result.

Here is the lightmap of the floor.

And the settings of the lightmass in the world propreties

Im trying to understand the lightmaps and lightmass and all those things by looking at threads, tutorials and videos.

thanks in advance