Why, Glow?

Glow moved my ovulation day and fertile window back. I didnt add anything besides temp and cm this cycle. Before today, it had my fertile window go from 7/8 to 7/14, with the 12 as my 32% chance. I thought I ovulated on the 12, I had ewcm and that dip. Now I'm confused? Is it that cover line? Last month my temps were higher than this month (we just put our a/c window unit in at the end of June). Could that be giving me a higher cover line?