16th Note Grace Note Sustaining for too Long

I took a piano book, found a song and put the notes into MuseScore. I listened to the original piece and the 16th note grace notes were fast but still audible. I then listened to it through MuseScore and it was much slower. Both the original piece and the computerized piece were at the same tempo, but the computerized version won't be as good if it can't play the right note length. Also, I've tried the other grace notes and they're either too fast or even slower. Is there a way to define how long it lasts?

At 104 bpm one 16th grace note is sustained as long as a quarter note.