Fitbit app giving me way more mileage for my walks

[Bs200789]

Hoping for some help. I just updated my phone to an IPhone 11 last week. So far the three walks I went on with my new phone has given me .15-.20 more than I’m actually walking. I’ve uninstalled and reinstalled and still issues. I turned on the all day sync in hopes it will fix it. I know that the GPS location notification has come on before I updated my phone. It always shows up before I start my work out and I say continue because I want to walk but it’s never been this off before and I don’t want to cheat myself. 

Moderator edit: subject for clarity

[LiliyaFitbit]

Welcome to the Fitbit Community, @Bs200789.

I appreciate your participation in the Forums and sharing that you're getting more mileage for your walks after switching to your new iPhone 11. Thanks for trying to resolve this, I totally understand how you are feeling and I am here to help. I appreciate the additional details and would like to advise that Fitbit devices use either built-in GPS or the GPS sensors on your nearby phone to track your distance, pace, and route. When you track an activity through the Fitbit app, the app also uses the GPS sensors on your phone to calculate these stats. I would recommend checking out this article with information about the different factors that can affect connected GPS.

You can also find useful information at How does my Fitbit device calculate distance traveled?

If you have any questions, please don't hesitate to contact back.