Uploaded below are the difference between proper and improper belt fit on Ather.
The belt in Ather is just 50% on the sproket, which is definitely not a ideal fit, which might cause wear & tear of the belt much sonner than the lifetime.
There should had been sidewalls on both sides for both end of the pulleys to avoid sliding of belt like this.
Proper belt fit:
Improper belt fit on Ather 450: