warwick jumped twice ?!

Unless the first jump you're talking about is his Q, which can follow a target even if they use mobility as long as you ran away before he bites you, as it's coded as 2 components consisting of a dash to a target (with low activation range but higher follow range once in motion) and a bite after reaching the target.

EDIT: Warwick's Q probably also sometimes seems like a jump since the player can hold Q to allow Warwick to swing to the other side of the target when biting them, which together with the fact Warwick's Q follows a target and so it would seem that he "jumped". But yea.