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Dimensioning a slotted hole

Hello!

I need to dimension a slotted hole in two different ways, as a linear profile dimension and true position. I measure the slotted hole in the same way, as a bidimiensional profile and using filters (ouliers....) The results are very diferent, in the true position the result is around 1 or 2 mm and in the profile it is 0.2-0.3. If I measure the dimensions of the slotted hole (lenght, diameters of the circles, angle...) are OK. And also when the program is running I see how the points are scanned, so I see the nominal and the deviation, and in a visual way the slotted hole is OK.

Is it possible that dimensioning the slotted hole with true position is not the best way to do it¿? I dont understand what happened.

Thanks in advance!!