Small issue with V-Slot™ Mini V Linear Actuator Bundle

So its not a giant problem but just a question to the general audience. We are noticing that as we move the gantry on the actuator that the belt keeps moving to the left. Now the belt is not ruining of the side of the pulley but it is rubbing on the edge of the V-groove and may start to wear.

Is anyone else having this issue. Anyway to fix this ???

Thanks Steven