glow predicting wrong :/

Danielle
We have been ttc for a year now using how to track af and rough idea on ovulation date, even with info I have input since downloading another app have realised glow is out completely by a whole week, my fertile week is landing a week earlier using glow.. now I know why we haven't got a bfp yet..
Even though I know taking opks etc and recording this info helps glow to be more accurate the other app I have just downloaded is pretty much spot on.. 
Abit bummed tbh because I don't know what I can change on this glow app to keep it up to date with my new app.. I love glows servives and chat it's brilliant but predictions are out of wack for me completely.. 
Not sure if it's something I've input wrong or what

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