Just means you are bad at evaluating your weight.
If you take your starting weight on a morning after having eaten nothing much for days and then take your next weight after binging for 3 days, the difference will be HUGE because you were under-evaluating by 1-2 pounds for the first and over by 5-10 for the second.

Just eat less for a couple days, take a big dump and then weigh yourself in the morning.

Use your head man : D