Rengar & Kalista double ult bug

I was playing some bot with some peeps and one of them was a Kalista, i was jungling Rengar. anywho she chose me for the oath and was binded with her. when we both turn lvl 6 i would gank , i would ult and then she would. the moment i hit an enemy with it it would put me back to where she was and i would jump towards an enemy. i thought i was lagging so i did some customs to see if i could recreate the situation and did. posted the video. hope you can fix it

1. get kalista and a rengar to lvl 6 and ult together
2. the rengar will hit the enemy and if its in the unseen predator jumping range it will take you back to where she is and proc unseen predator.
3. if hes too far away from unseed predator's range it will work as intended
4. if you choose another destination aside from the enemy when the kalista ult clashes with an enemy, unseen predator wont jump but instead just put you next to her

i also had another try and noticed that when i hit the enemy champion i would make me jump the other way instead. so i would proc unseen predator behind us instead of towards the enemy thank you, and forgive me for my horrible incoherent writing.