Question i imported a generic model with animation that stretch normally on blender but in unity it dosent

i imported a generic model with animation that stretch normally on blender but in unity it doesn't (the model has a skinned mesh render and is generic) why is this happening?

the animation in blender


the animation in unity

 

Are you playing your animation on Unity? (meaning, add an Animator component to the Gameobject of your model, Create an AnimationController, put your animation into the animationController and assign the controller to the Animator)
Also posting a same question twice is not a good choice.