ATOS I 2M 350 scanning size issue

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Hi, I have a ATOS I 2M white light scanner. I start noticing the scanner size(dimensions) has quite deviate from hard measurement of Target. For example, I quick scanned a 123 Block and result that the scanned size are 2.988 Inches for "3 inches edges". I also tried cylinder and got -0.006" for diameters. Looks like the scanned part is shrink in size. I went through re-calibration but not solving the issue.

P.S. My measure volume is 120X96mm^2, should be a small and accurate setup.

I'd like to know if anyone has similar issue or know what could cause and how to fix it.

Thanks!