Ringing on only one side of the print?

Whenever I print a flat surface on the y axis, one side has terrible ringing and resonances, while the other side is perfect. It seems to only happen on movements when the printhead is moving back, not forwards, so I think its an issue with direction. Could this be a motor/driver related issue? The issue doesn't show up on any of the other sides, so i doubt it

The picture shows two different sides of the same print, both on the y axis.

i recently changed my cable chain to a USB, but the issue didn't go away, so I'm guessing its not that.

i've tried multiple slicers so its probably not a slicer issue. I've also slowed down speeds a ton, and nothing changed.

Could it be because of the x axis rail? the mgn9 i got has a super light preload, so it moves super easily, and might be susceptible to interference.
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Ringing on only one side of the print? - Rat Rig Community [Unofficial]