Pregnancy mode , wrong ovulation date but right weeks ?

Idk if it’s a new thing on the app .. but why after I put the pregnancy mode on (it randomly popped up) does Glow say my ovulation date is August 26th but I’m only 23 weeks and 4 days gestational ? If the baby was made in August wouldn’t I be like .. 27 weeks ? Depending on which due date I use all my other apps say September 23rd as conception for June 16th or September 26th for June 19th . Due June 16th by my period but she measures a few days smaller so by her measurements I’m due June 19th . At my first Ultrasound on September 26th , she measured three days smaller but I was still 6 weeks and 2 days .

First positive pregnancy test on October 5th