Issue with Leblanc's jump

So I've actually been seeing this pretty much every time I play Leblanc but there's an issue with her jump where, for the duration of the cast time of the original jump, she can be hit where she was initially standing. Even with a quarter second cast time, that's a time that she basically has the largest hit box in the game, and when you want to split second dodge skill shots, split seconds count. My thought was that the original jump should be instant, yet there be a delay before she can reactivate to return.