VCore 4 500 IDEX Toolheads move when moving gantry in Y

My X-belts are tight at 16.9 mm, my Y-belts are slightly more loose at 15.9 mm.
Measured at approx. 10 cm from the front with the heads and gantry approx. in the middle.
Solution
Ok, my bad. The motor for the second toolhead got mixed up with the right Y motor in the setup.
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