Are you perchance suggesting/implying that the judges play with the results each week?
It's right in their contract that when the results are extremely close that AI reserves the right to make the final choice on who goes. Someone posted the contract a couple of years ago. Now, since they never show us the exact numbers for each contestant, every week, AI certainly could play loose and fast with the numbers.
I think for the most part they let the chips fall where they may, BUT, when its close enough for them to dictate who stays and who goes, yeah, and they even admit to that. Doubt its the judges though, Lithgoe would be my guess.