As your car is a 2016 you should have the black anodised rear hub that should allow your drive belt to run centrally on the rear sprocket, if it is all assembled and aligned correctly. Chocadoodledoo's car is an early one with the silver hub that has different offsets and requires a spacer, or hub change to the later spec, to allow the drive belt to run fully engaging the rear sprocket. If your drive belt is running so far out of alignment that it has broken the outer guide flange, then something is wrong. I suggest checking that the rear wheel is correctly aligned and is pointing centrally between the front wheels and the bevel box sprocket is in line with the rear wheel sprocket.
