Glow says I was to ovulate on October 24th. I have 28 day cycles, it always tells me I'll ovulate cd15 (no clue why)

I didn't track this month because I found it really stressful and confusing at times. I had ewcm on cd 11 and 12 (which was oct 20,21) on my calender and then it was gone and hardly any cm at all now. When do you suspect that I ovulated based on this? Thanks so much!