A user reported that his displayed activity (from Toybox.Activity.Info) and saved activity info was incorrect on his Venu 3. The saved activity info from his Vivoactive 3 was correct. He was running both of them at the same time for the activity, which was sailing.
It is likely that he had swiped to his watch face and back on his Venu 3 at some point during his activity.
It is important to note that the saved track was correct. And, recalculating the activity information from the saved track was correct. It was the summary information as displayed in the app during the activity as well as the summary of the saved activity as displayed in Connect IQ that were incorrect.
This seems like it could be a firmware bug.
The application he is using is SailingTools: https://apps.garmin.com/apps/9e70e4a2-1097-49d4-b093-7c5cc5f0ca66
Note that I (the developer) attempted to add the following in the application, which did not help: