Counter Strike has a lot of mods and some of them change your controls without your permission. So, you need know how to fix it. There are two methods, one is GUI (Graphical User Interface), and other is CUI (Command User Interface) in nature. Follow the simple steps below
Start the game. Go to Options -> Keyboard Tab
Locate the desired action whose bind you want to change and then change it.
Start the console (The ~ button beside the ‘1’ key)
Write [bind “<key name>” “<action name>”] without the brackets but the quotes will be there. Then hit enter and you’re done.