Different WF behavior in VA3M, VA3 and SIM

I developed WF and tried it in SIM as VA3. When you change the settings of the App Settings Editor, all settings are perfectly changed and saved.
When testing this WF on my VA3M, there are no problems either.
However, I receive reports from VA3 users from the fact that the settings for this WF are not saved. If the settings are not saved on a real device, they should not be saved in the SIM. In fact, the functioning of the SIM does not coincide with the functioning of the VA3, which causes problems with the development and maintenance of applications/WF.