Hi Fabio,
Thank you for posting back and attaching the screenshots to describe the details of the issue.
From your screenshots, the copied rectangle's size changes.
I have tested in same version 2002(Build 12527.21104) of Semi-Annual Enterprise Channel of Excel from my side and I cannot reproduce. I also tried other different shapes.
Below is my test result:
You may try following:
1.Go to File>Options>Advanced>Display>select the checkbox for "Disable hardware graphic acceleration">click OK.
2.Use Windows Update to update your graphics drivers. (Windows Settings>Update & Security)
3.Perform a clean boot on Windowsto determine if there is any background program causing the issue.
4.Try reinstall Office.
In addition, are you using 32-bit Office or 64-bit Office?
Thanks for your effort and have a nice day.
Best Regards,
Tina