Like Clockwork - Glow Help?

Laura
Hi all! My name is Laura. I am 36 and my husband and I are TTC #1.  I consistently have a 24 day cycle.  I have loved using Glow as is has helped me inventory and analyze my CM, BBT, and symptoms. My concern is that the app consistently predicts a 28 day cycle so I am worried that it's not predicting my fertile window accurately. I have looked back over the past several months and my period normally starts 9-10 DPO but the app continues to predict 14 DPO in current cycle. Has anyone else had this issue? Should I be concerned that I'm not hitting my most fertile time or just go with it?  Any feedback would be lovely! Love and baby dust to all!