Ovulation change on glow

Jaylynn • Happy with my wife and three children, trying for our fourth :)
My ovulation cycle has changed on my calendar on glow all of a sudden anyone have any issues like this it's changed dramatically !!! Now I'm wondering if I missed my window !! I'm kinda mad at glow like why would it do that !? We woman ovulate 14 days after our first day of period correct !!!??? Well I'm going by this from now on !!! Annoyed with GLOW 
Annoyed