MIDI files not processing ornaments/trills correctly.

Example: https://musescore.com/user/37628784/scores/19870951/s/bwyoXy

In bar 5, the mordent runs: G, F♯, G.
In the MIDI (see below), it runs: G, F, G.

This happens several times throughout the piece.

I'm not musically trained so I can't be any more precise than this: I apologise.