challenges and choice of modes

I’m sorry, I really don’t know English so I’ll hire a translator. I don’t know if this has already been discussed but I see that when it comes to the challenges it doesn’t let you choose the mode or the map and the challenges that ask you to kill with a specific weapon you have to look for the map and when you don’t get the one you want the people have to get out of the game and that’s when the game then blocks some players, but it is the game itself that forces some players to be looking for the map to complete their challenges.