OPK- which day was “peak”, I disagree with my app

Liz • 37, trying for baby #2! 5 m/c, 1 d&c. 1 ectopic. One perfect almost 2 year old son who is my world.
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To me, CD 14 is the clear winner for strongest opk, which would be peak, but my app (glow is all over the place and keeps changing my O day entirely) thinks peak day is CD15... what do you think?

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