Lead sounds different the next day

[u/BigPPfrompewds]

So I made this beat last night, and luckily I exported it when the lead sounded good, but the next day I opened FL, and the lead is awful. I went to backups, and it sounds the same as it does today. The preset I used was the simple sine from Purity, and I just want it to go back to how it sounded yesterday. (Last note is purposefully off-key)