No positive ovulation but glow says otherwise..?

Jen • 💙💗
This is the third day of a flashing smiley for me and glow is now telling me it's a 33% chance today that I could get pregnant (usually what happens the day after I ovulate)...also, this is day 21 of my cycle and I still haven't ovulated. Normally I do on day day 18. Really confused!