I found a small bug that makes the game very difficult to enjoy

I have been playing a lot of league recently. I have noticed that there must be a bug or something that... Makes a few champs really broken for no reason, even if I have more cs, kills, better items, etc. I have taken time out of my busy life to write down a few of the champions that I have noticed the problem in within the past few days. Here is the list so far... and (I think Camille definitely needs nerfed, but I'm sure you have heard that a lot already) after any of these champs get a kill, they instantly destroy everyone on your team. I rarely do bad in lane, but something happens and the entire enemy team gets fed. I have been on a bad losing streak, but I don't care about winning(I like it more.) In all seriousness, I just wish I could have fun when I play, not stare at a black and white screen because a person pressed "R"