Bed Tilt/Mesh Clarification

Please help clarify for me.

Once you have done a bed level (I am using my beacon), "A", "B" and "C" are then level. No matter where I home Z on the board, the distance above or below for "A", "B" and "C" relative to "H" should be the same. These 3 points are level according to the probe and auto level.

From this point, I would see if my frame is skewed or bed is warped.

So why when I look at my mesh are "A" and "C" the same height relative to "H" but "B" is always much higher?
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