Is the each wheel on straight and tight?
If so, spin each wheel with the tire facing you and see if you notice any wobbling or warping effect. It's possible that either the axle of the wheel is bent or the spoke/rim is not true.
If the wheels have spoke nipples that can be adjusted, you may need to take it to a bicycle shop to see if they can true the wheel or otherwise it'll need to be replaced unfortunately.
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