Glow app ?s

Elizabeth
On the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, why does it say my period on days I didn't log a period?. It says period days on aug 26-28 but I didn't have a cycle I miscarried on Aug 5th, an still haven't got my cycle this month. I feel like the app isn't being acorate.