OPK and Glow don’t match...

So, Glow says I should be ovulating today, but OPK says no surge. How come when I log the No LH surge in Glow it doesn’t change anything?? I’ve checked OPK everyday in my fertile window and they have all been no surge. I’m guessing the app is just off by a few days, but I don’t understand what it doesn’t change any data based on what I log... Anyone else have this problem??