Azir shakes in place mid-dash (Q-E Combo)

When using E to dash on one of your soldier, using Q mid-dash will cause Azir to go farther (what we want) but when he reachs his soldier he starts shaking in place for about half a second during which he can't do anything. This bugg happens most of the time when i try this combo, there are no specific situation in which the bugg occurs, quite random.