strange noises on y (vCore4 IDEX 500)

Hello, I just finished my build and i am a bit concerned about the rattling noises on the y rails. If you check out this video, you can clearly hear the sound. https://cdn.discordapp.com/attachments/1223286652949106748/1351344121192775853/76394870036__BCFB4BBD-F1A2-47C7-81B4-951331BF2215.mov?ex=67dab189&is=67d96009&hm=689e4d511cd0e2a9ab8777330d20c06b4b9b19e2952d993d8cd67852d1dcc630&
you can also see it in the input shaping graphs. x is clean, y is not.
I did everythign according to the build guide including cleaning the rails with isopropanol and lubricate it with high performance grease for fast rotating bearings.
I hope to find some help here.
t0_resonances_y_2025-03-17-235905.png
t0_resonances_x_2025-03-17-235844.png
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