Looking at the values of those four numbers, instead of just looking at the difference between pairs of them, might illuminate the question. Provided you can replicate the phenomenon reliably, that is.
Those timers are not very precise; to start with, their resolution depends on the operating system you're running on and can be as high as 50 ms or so. I also remember reading somewhere that under some circumstances the clock could even seem to be running backwards in time from one moment to the next.
Don't count on these timers to measure very short amounts of time very precisely.