Unfortunately, sometimes this happens. You can help us out by changing the mode afterwards. To do this, click on the respective entry in the list of your activities.
You will now see an overview of the recognized trip. Click on "Change mode of transportation".
Finally, select the correct means of transport and click on "Save".
Also, if you are in a carpool, please make sure that all of members of your carpool have started trip recording in the Pave Commute app.