Hi baghdad4ever,
If the current Keyboard Voices (Right/Left) and/or the current Multi Pad change when
loading a MIDI file (if Quick Start is activated) or when
starting a MIDI file (if Quick Start is NOT activated), so-called "Keyboard Voice Meta Events" were saved in the MIDI file before (maybe accidentally). To avoid this in the future, make sure that the "Keyboard Voice" check box is NOT ticked in "Song Creator > Channel > Setup" (or in "MIDI Multi Recording > Setup" on newer models) when saving a changed MIDI file.
To REMOVE the Keyboard Voice Meta Events from MIDI files I recommend to use the PC (Windows) program PSRUTI:
>>>
https://heikoplate.de/psruti.htmlAfter installing PSRUTI, please click the Help button to call up the PDF manual and read the related chapter ("Delete Keyboard Events", page 37 in the English manual).
By the way, of course, such unwanted Keyboard Voice Events can also be removed from a MIDI file
directly on the keyboard, but the easiest way is with PSRUTI. (In addition,
all files in a folder can be edited "in one go" if required (batch mode).
P.S.
A temporary solution (as already mentioned by Enildo) is to just press the relevant Registration button a second time. Then the original keyboard voices memorized on this button (which were modified by the MIDI file) should be loaded correctly again.
Hope this helps!
Best regards,
Chris