Poppy Ultimate and Miss Fortune's "Make it rain"

This bug, if real, occurred only in an ARAM game. I am not sure whether it can be recreated or whether it was something else.

There was a team fight near the enemy inhibiter and the enemy Poppy used her ultimate on me at full power (Playing Xin Zhao). Usually you fly in an arc towards your own nexus but I seem to collide with something mid arc and I land straight down vertically. If Miss Fortune's "Make it Rain" was a column, it seems like I collided with it. There are no other enemy champions that could have CC'd me with a vertical knockup, etc.

Team Comp:

Vs

Can anyone figure out what may have caused this??