MOUSE-4 Alt tab (PLS fix)

Mouse 4 is now alt-tab?
youtube clip at 0:34 I have mouse 4 set to area is warded ping Randomly, when I click it, it alt-tabs my game, which is really annoying.
Literally keep dieing in ranked from this I click mouse 4 to use my potions and i am getting alt tabbed its so sad!! :(
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