Might be your issue. If you have other uses for them I might recommend that you get some 123 blocks to level your X/Zs you can just put one block under your X on each Z side and lower them down and tighten up. They are precision thickness and I think probably one of the easier ways to do this.
I still have no idea why creality decided to constrain the Z axis' together when they are using sensorless homing and if the firmware was good they could level things out by ramming the top of the z axis like prusa does which works perfectly.
I wish I hadn't spent the money on this printer tbh, but for not I'm not having major issues with it.