You may consider to find out your BMI and not calculated by formulas, but using the old fashion tool: the caliper (measures the thickness of skin+subcutaneous tissue) at 7 sites of your body. Do not rely on the impedance scales/tools, they are not good for athletic population, but only for sedentary person (accordingly to latest research).
From my standpoint, (I fight my weight all life long), the reason could be too much carbs also. But I would not neglect the Gatoraide anyways, keeping the electrolytes at appropriate level. When I stuck with my weight, I usually change only one variable and see what happens. But I like to eat as a process, it gets me in trouble (confession).