What's wrong with this shadow?

Development Rendering
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1

Hi!
I have trouble with lighting and shadows. I don’t know why i have some black lines on my components or why nice looking shadows become a blurry and bad looking after build light. I hope someone can help me with that or tell me what i’m doing wrong. I’m adding some photos of this problem.

P1 one floor is dark and second is light

[Album] one floor is light second is dark

P2 how it look before build light

[Album] Before build

P3 also how it look before build light
Imgur: The magic of the Internet (after is very blurry)

P4 and how it look after build light

[Album] imgur.com
2

First of all - chek lightmaps uv on meshes (P1)
Lightmap resolution is small (P2,3,4) - try to increase it

3

I try to increase it but actually nothing really change. I’m not sure what about light building, when i increase it and build light in preview it reset to same bad look and also when i do that on production build nothing change. Here are photos with floor lightmaps uv configuration:
P1

[Album] imgur.com

P2

[Album] imgur.com

P3

[Album] imgur.com