eGo belt adjustment

Hi,

I was changing the tires for the first time and needed to set back the belt as I installed back the rear wheel. I managed to align the wheel, belt etc but 1 thing kind of worries me.
The one which worries me is the belt position on the drive-pulley, the inside one which transfer the motor power to the secondary belt which turns the real wheel.
Whatever I do the belt doesn't ride on its very center but to one side of it, the inside, towards the center of the bike. As the pulley has the "sides, fence" for the belt not to fall off the belt is basically touching them. The belt is not moving anywhere, it is riding on the center of the pulley on the real wheel, it is not heating up (from imagined friction between the belt and the drive-pulley), the pulley is not heating up so I guess I managed to fit it well. The manual doesn't pay attention to the position of the belt on that smaller pulley so I assume it is not so important...or am I wrong?
Any experience with the belt settings and how important it is for it not to touch the sides?

Thanks!

Babo