Confused please help!!

Joelle • 2016💍 Juiy 26th 2017. March 7th 2019👨‍👩‍👧‍👧Military family 🇺🇸

So these are my ovulation test but I took that one yesterday and it was lighter than the one before. It also says it’s still in my high fertility. So why is it lighter than the one before because my app says my peak fertility isn’t till tomorrow. Help please