Assuming there isn't some type of physical damage to the machine (something bent or tweaked somewhere), usually tracking issues tend to be maintenance related..... It can be caused by a worn drive, or attachment contact wheel(s), worn parts in the tracking mechanism, or even worn bearings.
My suggestion would be methodically go through the machine and check everything out. Personally, I keep a supply of bearings in the shop for just such instances.
Grinders, like any other machine, require routine maintenance. If you've not done that in a while, now is the time. If you let it go, things will only get worse.
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