Cambelt wobble

[Dan s3 audi]

Fitted a new cambelt kit from Audi.
Gates Belt - pump and New hydrolic tensioner.

I have noticed when the car is running that the belt is moving side to side by a few mm on every complete revolution of the belt. Non of the rollers or pulleys are wobbling.

Is this normal to have a bit of movment or have I fitted a bad belt?

I have uploaded a video onto YouTube

 

[Dan s3 audi]

Anyone think this is a problem or not?