I see I replied at same time as buzzplop.
I don’t think you need to bother swapping out cables. Just make sure they’re all correctly plugged in. It’s a different way of going about troubleshooting than I suggested. Do whichever one seems easiest to understand for you.
Here’s what I wrote:
The z-axis should be working together in unison. Bed leveling just adjusts the height but they should both be at the same height. Check that both z-columns are properly seated in the base and that the x-axis is level between the two. Loosen the screws to the x-axis and make sure that both z brackets are at the same height. If they’re not that could cause strain and noise.
You can remove the x-axis and check if they’re moving fine by themselves.
If one of them moves differently from the other then you might have the linear module problem and need to contact support@snapmaker.com
-S