Playback going extremely slow

I haven't checked on my piece in about 4 months, but now when I try to play my piece, no matter what tempo I set and what tempo is written on my score, it plays at 34 BPM. What doesn't make sense is when I try to upload the piece, it plays at the correct tempo. Not sure what the problem is but it's pretty much impossible to edit the score to my liking with how slow it is. Any help would be super appreciated!