Blender mesh getting stretched when animated in Unity

Hi everyone, I'm working on geometry augmented reality app. The purpose is to show the animation of opening and closing the nets of solid. Everything looks fine in Blender, but when I exported it to Unity in fbx format, the cone animation getting weird. The mesh is getting stretched when the animation played in Unity. I tried some solutions like applying the rotation and scale transform on Blender or change the blend wights on Unity. But none of them are working. Please help
Thank you