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.

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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