Auto attack move not working bug

I changed my auto attack move key binding to ctrl+ right mouse click, but every time i start a new game it doesn't work until i re-key bind it. for example when i start a game and press ctrl+ right mouse click near a minion the character is going to where i clicked and then attack rather then auto attacking as soon as i am in an AA range while that its still showing the red click (normal walk click is green), when changing the keybinding to something else and when changing it back to ctrl+rmc its working normal for the rest of the game. Please check why it happens btw ,The normal A and left click auto attack move function works properly.