Why are LightMaps causing blurry shadows?

Development Rendering
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9

What i get if separate faces ground have 4096 res berth 1024

13838-снимок+экрана+2014-08-27+в+12.53.03.png
13838-снимок+экрана+2014-08-27+в+12.53.03.png1027×803 336 KB