Help! Glow is calculating my ovulation incorrectly!

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I have entered in my health profile that my cycle length is 28 days. Why does glow keep calculating my cycle as 31 days?! It always has my ovulation week wrong because of it. Even when I go in and manually edit my period on previous months to make it a 28 day cycle, it will not edit my future cycles. Anyone know what I can do to fix this?! Any advice would be much appreciated as I am ttc!