Issues with lightning and shadows? Help wanted!

Anyone knows how to fix issue below? I can see some shadows and also light goes through some wall parts. I have checked Shadow Two Sided option which fix main issues with light going through but can rid of others. There is only two Point Lights in scene with default values and no other light. Thanks

Looks like you may have issues with your lightmap UV’s along with having low lightmap resolutions for those meshes

Any suggestions on how can I fix this? I’m still learning UE 4. Thanks.

What have you tried so far?

I follow tutorial below both parts, and I managed to fix issues with lightning from this tutorial (most of it) but shadow on plane floor with material is still there visible. I notice when I turn off cast shadow it disappeared, but that’s not option for scene :S any other suggestions? I change resolution but still there.