Why does amumus q stun you?

Everytime Amumu throws out his bandage ( I'm asuming it's his q ) it says and I quote "rooted" but I am not even able to aa or even place a soldier with Azir. Why? Is it a bug? how come they haven't fixed it yet?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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