I upload pretty much everything to Strava, even two mile walks with my lovely wife and our silly pooch. I used to add walks as a ‘run’ but now that there is a separate walking challenge each month, walks are uploaded as a walk.
However, my Garmin 920 doesn’t have a walk function, so I use the run function, and then when it comes to uploading the walk I change the sport from run to walk. This is where the anomaly occurs. Strava thinks that as this activity is now a walk, it must remove this distance from the monthly running challenge total. As of yesterday I had run 14 miles so far in November, but when I uploaded last night’s 2 miles walk, this total dropped down to 12 miles.
Fortunately there is an easy fix. Leave the challenge and then rejoin and it will display the correct total.