Gangplank Orange allows him to have cleanse passive

In my last game (I was Shaco), a gangplank ate his orange two separate times, and after he ate the orange, he walked through Veigar stun, without being stunned. Maybe a bug, maybe a glitch, but I'd like to see this fixed, because it allowed the enemy GP to not be cc'd by Veigar stun (literally walked through it, no QSS or Cleanse SS), which lost us a game changing team-fight. Hopefully it can be fixed,

Thank you for your time, Who am I Kicking (iFeederDog, since boards hasn't changed my summoner name)