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position, where is the problem?

Hello, I am determining the position of points B1 and B2. There is no problem with position B1, but with the position of point B2, the position is displayed outside the given point. I don't understand why, the problem will probably be in the measured element, but the measurement and evaluation procedure of both elements is the same. Does anyone have experience please?

EDIT:The moment I turned on the text search in the log for the position of point B1, the results jumped by more than 4mm! What it should be?? I'm mad >Disappointed

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