Why doesn't my fertile window adjust to positive opk?

Question

Glow predicted my fertile window last week, today I got a peak opk and entered it in but glow fertile window didn't adjust - is this normal? 
Why doesn't it do that?

Answer

Glow doesn't update your fertile window at all - not for OPKs, not when you add your CM observations, and not when you chart your BBT. It's basically the rhythm method, which is just averaging your cycle lengths to predict the next one and placing your fertile window in the middle. You can't really rely on it for TTC or TTA.

Answer

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Why doesn't my fertile window adjust to positive opk?

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