Title says it all
I honestly have no idea what you could mean. As far as I know, RNG is working as intended. 
My 5* Hulk twins are saying the same thing…
i got a 5/0/5 phoenix. how many wasted covers before i get 3 purps?
My 0/1/7 SS laughs at your misfortune. I bet you can guess what his most recent color cover was.
my 0/3/0 OML will likely feel your pain (but heal really fast) my poor Goblin only has one cover (black)
Not long ago I was rechamping 2 
(I know, it’s much lesser pain, but anyway) 
I had him at 0/5/5 and 18 blue and red covers (that makes 28 in total) before first yellow appeared. Working as intended.
This reminds me of the guy who got an extremely Reluctant Hero back when OML was new.
That guy has 5x for red, 0 for others.