I create three different groups of strands using "edit guides", on top of the "mesh fom strands modifier" with enabled Str.Group Tex.Islands and Create Texture Atlas I assign a "UVW unwrap" and it shows me three islands created. Ok. But when I start editing the strands with comb brush in "edit guides", the islands become shorter - why is this happening? With each new group, they are getting lower. For example, on this image, the deviation is negligible, but it is. 
zxc.PNG
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zxc.PNG
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