Yeah, so they are measuring how many calories you burn just sitting, doing nothing but breathing.
Going to work, walking around the office, driving, cooking dinner, all that boring shit burns calories.
Working out burns even more. You simply need to increase your activity level and eat healthy. You are on the right track with working out, a little cardio at the end. Keep at it for 3 months and you will see results.
Your goal atm is weight loss, so things like avocado and eggs are high in calories and can be substituted easily. I would substitute that snack for tuna and salad, or tuna and vita wheat.