One thing I dislike about Glow.

The DPO on my BBT charts don't match up. Glow is saying I ovulated on CD 15, Fertility Friend is saying CD 13. Why doesn't glow update my ovulation day based off my BBT and +OPK? I love so many things about glow, except it not updating ovulation day. That means my % of conceiving that Glow gives me is wrong too.. it kind of defeats the entire purpose of the app.. I only keep it installed for the community part of it.