Chat Room problem

I have no idea if this has been posted, but there have been several instances where people are fighting for roles in a given game. What has been happening is that say, for example, player "A" calls ADC on the chat room first, and it appears as the first call on his screen. Player "B" then calls ADC on his screen and it also appears as the first call on his screen. The problem is where Player "B" cannot see that Player "A" called ADC first. A few other players also see that Player "A" called it first; the call of Player "A" is not seen on the screen of player "B.

Is this a possible lag on entering the chat room? It is messing up champion select and team comps. Thanks for your time.