Reply to Volume unbalanced wih cartridges / Shure M35s

So a few months ago I purchased a pair of new Shure M35s cartridges, now the problem I have is that on both Turntables there is roughly 2-3db defference between the left and right channels, the right channel being the louder one.

Is this something anyone else has encountered? If so, is there a fix?

The turntables in question are Vestax PDX D3 MKII's, Standard Vestax Headshells, all running into a Xone:22 mixer.
Also it doesn't matter whether I swap the headshells around, still the same problem, have also swapped the headshell wires too.

Any help would be appreciated.