Issue:
You have added Transformation settings in your Civil 3D drawing, and after saving and re-opening the drawing the settings have not been save and have been changed to different values.
Current Settings (in 2018):
After opening in 2019-2021:
Notice how the Transformation settings are not held from the saved drawing.
Causes:
This is a known defect with Civil 3D 2019, 2020 & 2021. The defect is logged with the Autodesk Civil Development team as CIVIL-26981
Solution:
The only solution / workaround at this time is to use Civil 3D 2018 for those projects requiring that needed Transformation Process (it can communicate with 2019-2021 without issues).
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