Rep range to burn fat

I'm doing a workout in one of the Muscle and Fitness magazines that consists of varying rep range for the different muscle groups.  Here is an example for chest:

bench press 3 sets 4-6 reps

incline dumbbell press 3 sets 6-8 reps

incline dumbbell fly 3 sets 10-12 reps

cable cross overs 3 sets 15-20 reps

Doing this type of workout seems to make me heavier and I weigh more on the scale than when I strictly do high reps between 15-20 rep range.  I want to lose 20-30 pounds and don't know if the heavy weight and low reps is causing my weight to increase.

This is an example of what is known as Linear Periodization. Try keeping the rest periods to a minimum and also try doing cardio acceleration in between those sets. watch here.