Warwick ult goes opposite direction

So I'm playing a lot of Warwick and I just played a game in which my ult 2 times went exactly into the opposite direction of my mouse. The rest of the time it was fine but these two times it went exactly the other way. I play with smart cast and I'm sure it was not a mistake by me because I jumped the wrong way without any reason to go there so my mouse couldn't even have been there by mistake. This never happened before.
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