Had the same experience, whatever they did has made the tolerances for setting up a breeder much, much tighter. The solution that has worked for me is to make sure both boars are on the same level inside the breeder and then cover the top with a floor piece, flush with the top of the half walls and drop the food on top of that. This works, but its finicky as hell, if anything is even slightly off, no dice. But it can still be made to work.