Random numbers with PBP aren't really random, they're pseudo-random.
If you seed the random number generator with X, you'll always get Y. That's just the way it is. That's what the PBP manual means by 'walking length'. All things being equal, the random number output will repeat itself with the same sequence if you use it exactly the same way every time.
Add some element of real random-ness, and you might get what you want...i.e. start up one of the timers and pre-seed the random value with the timer value when a button is pushed, that's just one example.
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