A little more information from your side is expected, like the version of IMFD, Orbiter, stage of your travel while you're saving the state.
Have you got IMFD open on MFD display(s) for quick-saving the simulation state (MFD needs to be active on LEFT or RIGHT MFD to make its state saved)? Was the engine burning during the save? etc.
I can't reproduce this when I set IMFD parameters, next do a quick-save, and then restore that scenario, but I only tested it after setting parameters.