Help!

Risa • Mama, teacher, reader.
Why is Glow predicting that I'm due for my period next week when my cycle just started 11 days ago? I tried adding past cycles to see if that would change things and nothing. It also says that my most fertile days were the two days immediately following the end of my period.
​I'm trying this app because it was recommended by a friend, but so far I'm not impressed.