Actually, folks, probability has nothing to do with it.
The devs have already stated that the RNG is prone to streaks of similiar values, and that they were looking to correct the issue.
Since the streaks can occur at any point in the distribution, the overall probability numbers stay the same, but it means that small samples are much more likely to be skewed from what standard probability calculations would indicate.
A way to look at it would be an unfair six-sided die (As opposed to a fair one), where there was an additional modifier that made it 20% likely that any number rolled would be repeated in the next roll, instead of being a fair die roll. As this could occur to ALL 6 possible results, the overall results would appear to be a perfectly normal probability curve - but the actual data, if examined closely. would show that the chance of two consecutive rolls being identical to be much greater than the expected 1 in 6 chance, in a manner that would indicate some sort of external bias.
To use another gaming analogy, since EM brought up Acey Ducey, imagine if you were shooting craps, and there was something that altered all die rolls in the same manner as my example above. The Probabilities would balance out in the end, but given that one wins by rolling sevens, or rolling the same value that you previously rolled before hitting a seven, you'd end up with house seeing lots of big losses, if people played intelligently, and didn't let the pot ride too long.