All Instruments defaulting to MDL Bassline

Hey guys, so I am not sure how many people are here, but I am not quite sure what I did. But now all the instruments default to the MDL bassline soundfont and I just want them to go back to normal without manually switching the sounds back all the time. It saves the sounds when i save, but it is incredibly frustrating when I start a new score and having to switch the sounds everytime. Is there anything I can try? Thanks.