confuseddddd. help!

Amy • Wife to the best husband 2/6/16 💙 Mama to an Angel Baby 👶🏻
If my cycles are 28days.... 
How come GLOW + OVIA predicted it at 32+ days? I'm so confused. 
I even ovulated late this month. 
Today I'm on CD 27... meaning tomorrow I should start my period. 
This is confusing.... 😑