FJ Software

If I want to delete any number from call list (dialed, answered or missed) in the MyPhoneExplorer there is a yellow or grey icon early in line.
I can delete the grey marked icon lines, it's ok, but I can't delete the yellow marked icon lines.
Why?

cause its not possible to delete calls via external software on the phone. They greyed calls are in the archive on the PC - NOT in the phone.

Thanx, for Your reply!