I was doing my quests while being on auto pilot and not paying attention and then noticed that it says I did 16 Cursed quests out of 15. I'm not sure if the number is glitched or if I indeed did one extra quest that I wasn't supposed to do. Did this happen to anyone else?

Occasionally I get a random event that gives me an extra Wizard quest. Maybe you got one for Cursed Quests and didn't notice?

There's a random event that can give an extra quest.