How does glow track ovulation?

Jackie
Instead of being green during the week that I tested a positive lh surge, glow had my calendar set for mostly the week prior (when I was testing mostly negative OPK). There are 5 days I tested fertile after what glow considers my ovulation....makes it tricky to track when my AF should happen.  
Can I manually change it or is this really when glow thinks I ovulated? Any help is greatly appreciated.