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Hello, @Ada40! Welcome aboard. 
mmm...You can fix this modifying your Smart Track settings. By default, SmartTrack recognizes an exercise that lasts at least 15 minutes. You can lower this setting to 10 minutes, or increase it as high as 90 minutes. For example if you only want SmartTrack to detect your longer walks, you might change your duration settings to a 30-minute minimum. To modify your minimum exercise duration do the following:
- On the Fitbit app dashboard tap the Exercise tile to open your exercise history. This is the tile that says "Track exercise" if you haven't worked out today. If you've already worked out, you'll see the exercise category on the tile instead (for example, Run or Hike).
- Tap the gear icon in the top right corner, then tap the target exercise and adjust the duration.
Give it a try and let me know how it goes!
Best Answer