Janna ULT reset bug into Poppy ULT

I did this about a week ago been some what busy/lazy so I'm finally posting about it now.

Ok so I was in a fight trying to stop enemy from getting baron with my teammate Nasus. In a 2v3 while we wait for team. The enemy team was already around half health so Poppy decided to try and ULT us away while we stood next to river wall straight across from baron. I timed my ULT to not only counter her ULT but heal Nasus for clean up duty. Instead my ULT knocked Nasus back to stay in the river and my ULT reset while I flew into blue buff from Poppy ULT. Now I know Poppy has ULT counters I just found it weird how my ULT got reset on Janna so I decided to post this. Not only that my ULT knocked a teammate back into the enemy which I didn't understand.