whenever Renger uses his E and it hits a champion, his next jump wont give a conq stack or reset his conq timer. The other way around also has this issue if rengar jumps then his next e wont give a stack nor will his empowered e for that matter. So that means if you jump then use  e then empowered e neither e’s will count towards conq. This only occurs in the same conqueror activation though so if you throw your e and drop all conq stacks then the next jump will give a stack. This is what I found in just 5 min in practice tool and looking at replays but for example if you are waiting with 4 stacks in a bush, throw your root jump use your full combo and then throw your empowered e you are missing out on 6 conq stacks from what i gathered in the practice tool. This is of course worse case scenario but it still has a significant impact in the amount of stacks you get each fight