The pigs usually have their assigned spots where they sit and beg at mealtime. But sometimes when you're just walking by, they run up to get your attention. And then all seating assignments go out the window. It's a free-for-all in who can wheek the closest to the human and maybe earn a carrot.
In this case, there was no carrot to be given out. After they fought for the best space, I bet they were disappointed that neither of them earned a prize.