Do i have to understand this?

Duoing with a friend:

Me: First role Jungle / Second role Mid Him: First role Mid / Second role top

I got autofilled bot ADC He got Jungle

[zombie-brand-mindblown]

I mean, if the game give us Jungle, why to the one who didnt chose jungle anyway instead to the one who picked it as first role?? I dont wanna know how often this broken shit when i solo my ranked games.