Two things:
1. You've lost a lot of fat and gained a lot of muscle. Muscle weighs more than fat, so your net weight loss is lower than you thought it would be. Nothing wrong here.
2. When are you doing your workouts? If you do them before eating in the morning, you will almost immediately start burning fat since there are no carbs readily available. Otherwise, you're going to be 20-30 minutes into your workout before you start burning fat.
It's good progress, really.
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Tom
"It hurts so good..."