[GAMEPLAY] Missing Orianna Ball

I was playing Orianna on ARAM earlier and I noticed my ball would disappear sometimes until I used another spell. It wasn't on any teammates either. When I used a spell again the ball would appear and move from me to where I set it to go.

This is after it happened for the second or third time and I decided to take a screenshot:

http://imgur.com/nUr9kUY

Edit: https://vid.me/L9F2

This is the first time it happened. Each time it disappeared it was after I shielded myself.