First you have to stop comparing yourself to "every" bandster. Men will almost always drop weight faster and quicker than women, there is no way to fix it.
Second if you have lost 30 lbs in the first 3 months and you look at Bandster B and they have lost 50 in the same amount of time, don't immediately go "Ok I have failed, or I am doing something wrong." Enjoy that 30 lbs and congratulate yourself. Second do this little math formula.
(lbs lost / starting weight) * 100 = The % of your total body weight you have lost. Now follow me in these 2 examples to see why this is important.
In the example above Bandster A has lost 30 lbs, their starting weight was 250. Bandster B has lost 50 lbs, their starting weight was 425.
Bandster A = 30/250= 0.12 * 100 = 12% of total body weight lost
Bandster B = 50/425 = 0.1176 * 100 = 11.76% of total body weight lost.
As you can see, yes they have lost almost 2x as many lbs, but still come in at less overall weight loss.