Poppy Heroic Charge Bug When Cast On Mini-Gnar? Mini-Gnar Hop bugged or working as intended?

A few games ago I was playing Gnar vs Poppy top lane. I encountered Poppy at the tri-brush and began to kite her back to my tower. Poppy cast heroic charge on me ( as i anticipated it) to pin me to the wall below top tower. As Poppy casted Heroic Charge, I Casted Hop to the side immediately, putting me in what seemed like a safe position to be charged back toward my tower. However, that's not what happened. In the air and seemingly safe from the charging Poppy, my character (Gnar) bugged and went back to where I was at the start-up of Hop, on the ground, and I was pinned by Heroic Charge against the wall I hopped away from. Poppy did not activate her W skill to prevent jumps and dashes until after I was pinned to the wall.

So is this a bug, or a strange way of things working as intended?