Tool Setup (File - Open Tool Library - by copy)

Hello, we copy our 3D-Tools into the Tool Setup.
In the most cases we can reload the tool several times and the parameters that we have changed keep stand.
But sometimes the parameters (for example diameter) will changing.
Have anyone an idea why this happens or doesn't happens?
Thanks a lot.

Regards Bernd

Here an example: Diameter was manuell changed from 46 to 46.1111. If I reload "by copy" a second time the value  keep stand. But this behave is not allways, sometimes it changes.