So confused...

So apparently on this app I’m my fertile window isn’t open until July 16. I ovulate in 12 days. My last period ended on July 9th, and started on the 5th. I got off birth control on the 9th. I have eve downloaded also and my fertility window started on the 11th and ends on the 17th.. I’m so confused. Will someone help explain this to me? I’m not trying to get pregnant but I hated birth control and my body needs a break from it... I just don’t understand what this all means