Astra's strange behavior (range 1.2-8m, not 0.4-8m)

i have an orbbec Astra scanner and AstraSDK-0.4.0-20151014T193139Z-win64.
As i can see Depth viewer shows depthmap in range 1.2 - 8m, but not from 0.4m.
Could you help me with this problem? I’ve no oppotinity to test other astra scanners.