I had four cats who have been coexisting in my house with no problems. Then, recently, I adopted a new kitten, Blue, who is now 5 months old. A few weeks later, I adopted a younger one, Zo, who is now 2 months old.
Now, when I fill their bowls, Zo is the first one to get to the food. He starts eating right away. As soon as he finds out that I am filling another bowl, and of course before even finishing the first bite out of his own bowl, he leaves it and goes to the next one. And so on until I fill the last bowl. The other cats then get to a bowl and start eating. As soon as Zo finishes his bowl, he moves on to another one, pushing away the cat eating from it.
Blue, on the other hand, is the second to get to the food. He starts eating. Then, after a few bites, he leaves his bowl, before finishing it, and goes sniffing another cat's bowl. He might just sniff or, more often, push him/her and digs into his/her bowl.
I realize that kittens usually need more food than adults. That is why I try to make all portions bigger than the portions I used to feed my adult cats (since I cannot seem to control which cat would eat from which bowl).
Now, Zo is a bit of an eater. I never saw him stop eating unless something much more interesting is happening (or food is out). :D I once watched him finish half a chicken. :D He even has a hernia because of this. (He is being treated for worms, if that is relevant.) But Blue is not; he stops once he is full, even if there is food left. So, I do not understand why he leaves his bowl and goes to another cat's bowl.
I really hope there is a solution either to control both kittens or, at least, Blue. It is quite hard to stand guard every time I feed them, especially that some of the adult cats get tense either by the kittens' attempts to steal their food or my attempts to control them and leave before finishing their meals, which makes them hungry, which leads to repeating this whole thing again even before the next meal. Closing doors is not an option because closed doors also get some of the adult cats tense and leads to them not finishing their meals. One of the adult cats goes outdoors and comes back on his own. This whole situation also pushes him to spend more time on the streets than he wants to.