Can't figure out what is happening with Warwicks ult

Hi guys, This happened to me yesterday and has been bugging me ever since... I just can't figure out what happened: is it a bug? It was not the first time, I had already noticed that {{champion:64}} and {{champion:67}} could push me away while I was leaping (even though I'm pretty sure WW was supposed to be immune to CC during the leap), but this time is actually worse because I did land my ult. Does anyone have any clue about what happened? Thanks in advance!
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