How does glow predict ovulation?

Al
This is my first cycle but I've been chatting for months (in other apps) and am pretty good at it. Glow tells me this month i ovulated 3d after my temp shift/peak day, which seems wrong. And while I'm at it- how does it determine the chance of pregnancy? As a "test" I told it I had sex 3x during my fertile window, and it says my chance of pregnancy is 1%. And finally- it asks what position you had sex in and if you had an orgasm, but it DOESN'T ask if it was protected or not!! That's a million times more important to you chances of conception than position and orgasm (which are pretty UNimportant)