That is the Move IQ that indentifies the activity. It can sometimes be identified incorrectly and especially when you do an activity that isn't an activity in Garmin Connect like Nordic Walking. You can probably make it identify the correct activity type by changing your movements, but I don't see that as a good solution.
The solution is to start an activity manually. Then you can select the correct activity type.
I've turned off Move IQ since it often identifies incorrect activities. When I do an activity I will start an activity manually.
