Arurf isn't so random for me

I have been seeing a pattern in my ar urf games; Jinx, Nunu, Veigar, Swain, Evelynn.

I'm not sure if it's because I have high master that on Swain and Evelynn, but I have been getting nunu and jinx far more.

I have gotten nunu 4 times (2 times in a row) and jinx 6 times (once again 2 times in a row)

Why am I getting the same champions so much when I haven't even gotten Soraka, Jayce, Taric, Sivir, Zilean etc..