What was the reason for not working properly the urdf package exported from solidwoks?

I encountered the problem of vibration of wheel as soon as I landed robot on gazebo, which is exported from solidworks. What is the reason behind it?

It woks fine in solidworks motion analysis but as soon as i land it on the gazebo surface it starts to vibrate and doesn't remain stationary.

Problem is recorded on the video please go through this and suggest the solutions.