Bed Compensates Too much

Hello all. Recently I notice that my printer mesh and the Z are compensating too much.
As you can see on the mesh. There are high and low points. On the highest point, the printhead is far from bed and vice versa.
Which makes me confused how does the software behaved.

FYI: I use LDO 42STH48-2504AC SpeedyPower for 6 steppers.
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