I’m confused please help 😩😩

Mia

So I’ve been doing the ovulation test since 8/6 and I got a lh surge which changed my ovulation date to the 13. I just took another opk just to see and it’s saying positive. Now my calendar has changed my ovulation date again what does that mean ? 2nd pic is the new ovulation date, 1st pic is my opk from today ? Any ideas ladies ?