Ovulated later than this app???

Tina
So earlier I posted I was having cramping as if I was ovulating. Well according to this app I ovulated last week, so I just decided to take an ovulation test right now just to see if the cramping is due ovulation, well my test came out positive!! I used the clear blue advance digital and I'm at peak! So now I'm confused!! Please give me some advice, has anyone been through this?