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CMM lost right position when checking the features

Our floor CMM which is GLOBAL S version:2019.2, always retreated back around 3-5 mm after checked surface and center hole with 90 -90 or 90 90, please check the attached screenshot. Is there anything with the head of the machine or something else? I did find whenever those issues happened. restart the controller or computer did not work, I have to regenerate the feature to clear the errors ( I think this is about internal variables storing data in the program).

Thank you for any helps

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