side play
On at least some saws, the upper wheel is attached to a bracket, carriage, or whatever you want to call it, which in turn is mounted to the frame on a pivot, and there is a screw of other adjustment at the bottom of the bracket, which can be adjusted to keep the wheels on a common plane as the saw wears. If your saw is configured in some such manner, still check the pivot points, to make sure that nothing is worn, but you may otherwise be seeing normal movement. And, by the way, when you will not be using your saw for extended periods, it is a good practice to relieve the pressure on the blade a bit, in order to prevent flat spots on the wheel treads.
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