I imported my skinned model and it looks fine in editor mode but when in running mode, it looks so wieried.
The model exported to .fbx from 3dsmax then imported with seperated animation files. (It means with xxx.fbx for model file and xxx@idle, xxx@walk etc. for animation files)
The first screenshot is in running mode and the next one is in editor mode.
I adjusted system unit of 3dsmax then re-exported the model and it looks ok.
When I first exported, it was too small so I scaled up the model inside Unity3D with “Scale Factor” in Inspector panel. The problem was that I only rescaled mesh model. I had to rescal all animation’s fbx files too!