More BBT questions /how glow chooses O day

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Okay here is my chart once again. I’m kinda of confused on how glow determines my ovulation day. It seems they chose the 16th because I had a positive OPK, but that’s not the day I ovulated, that’s just showing I WILL within the next 12/36 hours… so shouldn’t it be the cd 17? Ina previous post someone said because of my temps rising after cd 16, O would have happened on the cd 17. I know the app can be a couple days off but if I can manually fix it based on my BBT, I would like to do that so it can be as accurate as it can be. It would also mean I’m less dpo than I thought! Thank you!! 😘