TL;DR Right buttons do wrong things. Alright, might as well get a few things out of the way. First off I'm not experiencing this problem. This is for a friend. We're both new players to DayZ and ARMA, When we first joined a server, I asked him how to sprint. He told me that he could sprint by holding in the RMB. I thought that was weird because I hit W twice and that was the only way I could sprint. Well, I had a lot of issues with DayZ servers, mostly the BattlEye not responding error and I'd get kicked. After I found a server I could actually play, I'd played for a few hours and gotten pretty familiar with the controls. When I told him we could actually play together now we joined a server. He found a gun and aggro'd a zombie and he was asking me how to aim down the sight and stuff like that. Naturally, I told him it was click the RMB to ADS and LMB to shoot. He did exactly what I said, but instead of aiming down the sight he was throwing grenades. I'm figuring this is because his controls are weird and RMB was change firerate, which switched him to a grenade. I told him to reset the controls to default but it didn't help and his controls are still all wrong. Does anyone know why this is happening? Sorry if there's a really simple answer. I'm very new to the game. I've checked for different control schemes in the options but couldn't find anything.