IS ARURF Random working? Can we do PseudoRandom

I keep getting the same champions in URF pre-reroll. I got leona 4 times, renekton 3 times, talon 3 times and I've only played like 30 games. I don't mind playing them but when there are 130+ champions these probability are not right. Can we implement something like pseudorandom where the champions I have played has lower chance of showing up again? It's really annoying that I keep getting the same champions.
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