Anyone ever wonder why......

let me make an example because i am bad at explaining:

Me: Queue for top/jungle You: Queue for top/jungle Me: Gets jungle You: Gets top Nothing wrong right? me: Got jungle first pick You: Got top last pick ????????? explain how this happens i Queue for top/jungle and i get first pick with jungle even tho my primary role is top and the other person gets mine/his primary role when he is last pick...Explain to me how this happens