It's not a bug.
If Naruto isn't able to optimize his Clone to complete his passive (Rasengan Barrage) http://image.prntscr.com/image/0516dfff014e46869bfe2256e939321c.png
He'll create a new one due to his standard. http://image.prntscr.com/image/493fc22796434f9e95dc1ab4313db406.png
This interaction is intended.