Why the change in ovulation date at 8DPO?

So from the very beginning of this cycle my confirmed ovulation date on FF did not line up with my OPKs or my CM. Glow and Premom both said that I ovulated on CD14, but despite having identical data, FF said I ovulated CD13. It absolutely refused to sync up with Glow and Premom. Today, at 8DPO (would have been 9DPO according to FF) after I entered my bbt it gave me this message and change my ovulation date to be in sync with Glow and Premom.

I know these apps will take data and adjust their predictions as your cycle goes along. I removed today’s bbt from FF and it reverted ovulation back to CD13, so today’s temperature is what initiated the change. I re-entered today’s temp and it moved ovulation day to CD14 again.

My question is, at 8DPO why does my temperature all of a sudden trigger this change in ovulation date? Arwmt I far enough removed from ovulation that today’s temp shouldn’t affect the prediction?