OPK Confusion Clear Blue Advanced

Melissa ✨
This is my first cycle using the Clear Blue Advanced Ovulation kit. It came highly recommended to me after my sister used it and had success becoming pregnant. I started testing on CD 8 (yesterday) with a low fertility result as I expected but this morning when I tested CD 9 the result was a solid smiley face for Peak fertility. Glow predicts my fertile week begins tomorrow for the next 7 days. My cycle is pretty regular like clock work every 28 days. Has anyone ever experienced this before? I was expecting the kit to display high fertility first before the peak!! Thanks in advance for any comments or advice! 💕