Change Drum Notes back to Normal Piano

I have been working on arranging a song for an a capella group I am in. For some reason, one time I opened the musescore and half of the notes had the x for the note head, as if it were a drum note. I tried changing it on the mixer by checking and unchecking the drum notes box, I tried changing the note heads with the master pallete....Any other ideas?

I want the notes to be back in standard piano note style, without having to go through to each note and changing it.

Thanks!