Glow doesn’t learn?

Hey everyone - why does glow not learn that my luteal phases are not 14 days? It’s been 7 cycles I’m tracking everything and every time glow gives me a wrong period starting date estimation. Why does it say “science and magic at work” , what is the point then to input absolutely everything if it’s going to keep showing me a predicted ovulation date too early, and when I input my opk it updates my period to be way later than it is.. it’s learning nothing actually. 🙄🙄🙄