Question for anyone who might know the answer

Was recently playing a ranked match where i was playing ezreal and the enemy team had a wukong jungler. he was at low hp and was coming towards me so i began channeling my ult, he then dashed to me and activated his ult which caused my ult to behave very strangely, does him knocking me up alter the aim of my shot or does him knocking me up cause my ult to travel through enemies without hitting them? (i was knocked up when the ult fired and seemed to go through the enemy wukong without dealing him damage, i ask about the aim thing because i shot it exactly where he was standing but it seemed to move a little) any insight on this would be appreciated, i know its kinda a rare scenario but would still be nice to know what exactly happened there.