VC4 500 IDEX Y-axis having trouble

So I'm currently testing my resonance for my VC4 500 IDEX, and it seems that my Y direction is bad & not the same. I tuned my belts like the commission guide said and I even checked if the belts are equally tensioned with a pitch tuner app. Does anyone happend to know what the cause can be? Thanx in advance!
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