Example of my activity level

With MFP, your activity level is based on what you do outside of deliberate exercise. It's your home and work activity. You log your exercise separately (or sync your tracker and let the app adjust). It looks like you are fairly sedentary or only lightly active apart from your walks and runs. In your first example, 6 miles run/walk is about 12000 steps, so the difference is about 3000 steps, which can easily be done in walking around home, work, shopping, etc. If your exercise is consistent, you can use a different method of determining activity that doesn't separate daily activity from deliberate exercise. In a TDEE calculator, you would be active or very active. Just make sure you don't double count the calories you burn.