A much misunderstood thing about ketosis is that it doesn't completely take away hunger. In fact, the jury's out as to whether it's ketosis itself that acts as an appetite suppressant or whether it's just the drastic reduction in food intake that does it.
Whatever it is, there will be times when you feel hungry. Because let's face it, you are. Ketosis/food reduction/insulin stabilisation may be fooling your body some of the time that you don't need to eat, but you're operating under a huge calorie deficit. At times, you're going to feel hungry. The appetite suppression effect makes it easier to bear, that's all.
So you're likely doing nothing wrong at all. The good news is that you can usually ride out the hunger pangs - they do go away for hours at a time if you hang in there.