Wavy mesh

V-core 3.1 500
i am very confused by the wavy mesh i get, could someone plekase elaborate what is happening? i watched the leveling video a couple of times and already adjusted a lot regarding the classic height at C and low point at D.
I did already unscrew and retighten the lineair rail on the x axis but no succes yet.
I also read through a lot of older posts but couldnt find a solution.
Thanks in advance!
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