The "Raise Weapon" command performs the exact opposite action of what it is intended to do.

Your weapon is up by default and holding "Raise Weapon" lowers it while releasing it returns your weapon to the up position. If your weapon is down, holding "Raise Weapon" will raise your weapon and it will stay up after releasing "Raise Weapon".

The description for this command is "Temporarily raises weapon". It should function such that holding it will raise your weapon and releasing it will lower your weapon. Using this keybinding should set weapon down as the default position.