Glow app flaw?

Nicole • Baby 👦🏻 born 12/12/2015 and another 👦🏻 7/31/17. 👼🏼👼🏼👼🏼👼🏼👼🏼 5 miscarriages. Low AMH.
Anyone else notice that this app says the baby is 6" long at 19w and then the day you hit 20w it says the baby is 10"?!?  That can't be right!!!!  (At 21w it says 10.5".)