Almost 99% of all belt tracking issue is because of two issues, wheel alignment or belt tension, here is what to do:
#1 – Make sure the wheels are properly aligned as per the image below
#2 – Make sure there is tension on the belt. To do so you need to push the tension arm down and pull the tooling arm out, lock the tooling arm before you let go of the tension arm. The gas strut or spring will put tension on the belt
Keep in mind the belt also plays a huge role in belt tracking because belts will run on different spots on the different wheels depending on what accessories you’re running and also what type of belt you’re using (some belts have a stiffer backing than others). This is no issue whatsoever, the object is to have the belt track correctly over whatever accessory you’re using, nothing else matters.