Tree looks different with SpeedTree Modeler

Development Rendering
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  1. I am importing SpeedTree to Unreal 4.13 Editor, the SpeedTree package used is from:
    https://store.speedtree.com/product/free-speedtree-model-bundle-for-ue4-subscription/#prettyPhoto
  2. Then I find difference from Unreal 4.13 Editor and SpeedTree Modeler:

116527-lit.jpg
116527-lit.jpg1243×839 381 KB

116529-unlit.jpg
116529-unlit.jpg1259×845 383 KB

116551-material.jpg
116551-material.jpg1486×819 222 KB

Why did this happen and how to resolve this? Any help would be appreciate.