How does the RNG work?

So I can't be the only one who notices that, the in game random number generator does not seem random. First is the quite prevelent blue cart streaking with TF but that I can still wiff away with conformation bias or inteded mechanic. But the champion rolling. How is it that every game there is 1 champ at especialy at the higher tiers never shows up. There is 0 ppl with cho gath, 2 with t2 gnar and sejhs but all I get is knar sejhs and akali. Small sample size can be the reason, but every game it seems i do not get a random unit, instead i get a normaly distributed set of heros. with some heros having a 0% and others having a 33% or higher chance. Any other ppl noticing this aswell?
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