Weird wave on Vcore 4 500 hybrid mesh

Hi everyone,
I bought my first coreXY printer and I got this mesh. It seams really wrong for me. i made the mistake to install the magnetic bed too early.

I try to fix it with the guide by moving the front left but it barely change the result following those instruction https://www.youtube.com/watch?v=h7ZTq2dDTkM&t=881s
from what I get it may be is because of the x gantry.
Do you have an idea of why and how to fix it?

The printer is a Vcore 4 500mm in hybrid with default configuration.

Thanks
mesh.webp
YouTube3D Printers & a Whiteboard
This video is for those who struggle getting bed meshed with their RatRig V-Core 3.
Please feel free to jump to the chapter you are interested in.

0:00 Intro
1:05 about the v-core 3 frame and bed leveling
8:26 what to take care of in the building phase
9:17 the right square
10:09 build tips
16:50 adjusting the frame according to your bed mesh
...
RatRig V-Core 3: How to Get a Square Frame
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