Quote Originally Posted by Kyros View Post
No actually, that is exactly how it should work, averaged over time. You can calculate how often does X scenario should present itself fairly easily. If it isn't behaving as expected, then your seed has a bias and is not truly random.

Also, RNG seeds can have quirks to them, because again: not truly random. Take for example this number sets: 25 50 75, and 50 50 50 repeat over and over. Both average to 50 and both and you can say that both are truly random, but one of them is not really functioning as a RNG for our purposes.
Random by definition means "no pattern". Having the 5x fails in a roll spaced out as a characteristic would be a pattern.