Riding distance error

I was riding on June 6 and June 8, 2025. I am using Karoo3 now. My friends who rode with me have 138 km mileage, and my mileage is 126km. (6/6) when my friends came out with 140km, I got 126km.(6/8) I'm really upset because of this that my average speed has dropped. I get a gpx file from my ac tivity log uploaded to Strava, open it with another map application, and it shows 138km, 140km mileage values. It seems like Karoo3 is not doing a good job of measuring distance. Is this distance difference caused by recent update? Or are you checking with a known-issue? How does Karoo3 measure distamce? And let me know if there's anything else I should check. For your information, I updated something on 6/6. (Maybe map update) There have been no distance error before. Thanks HJ