Ovulation advice!

From the 21st -27th is my ovulation week, peak day was yesterday at 33% chance, so this app tells me. I purchased some cheap ovulation tests as "glow" is new to me to see the accuracy. Doing my logs daily and I'm confused to as how these tests turned out, to which days glow tells me I'm ovulating. Pictures are from day one of my ovulation week the 21st till the day before yesterday (25th). Its as the chance went downwards instead of upwards.. "CT" are to be equally dark on your peak day. Anything other (one line darker than the other or only one line) is negative.

Can your ovulation tests change drastically within a day?