Glow moved fertility window

Br

Hi guys! So originally based on my cycle, Glow had me ovulating Tuesday the 12th. I have been putting data in for symptoms and changes and had a LOT of EWCM on the 8th and continued through today. Instead of bumping my predicted fertile time up, it pushed it back almost a week! Why?! Anyone had this happen before? Or if you’re testing with ovulation kits, was their prediction semi-accurate?