Glow changed my cycle and I’m confused?

Re

TTC for a few months. Had a positive ovulation test on 7/31, so my ovulation date was 8/1 according to Glow. Now, my period just arrived today 4 days early and as soon as I entered it into the app, Glow now says my ovulation date was 8/4? I’m confused because my positive opk was 7/31, regardless of when my current period arrived. So when did I ovulate?! And why would the app change my ovulation date?

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