Whenever you take the new potion arrows out of the creative menu and try to get rid of them by clicking again on a different arrow it adds another arrow to the one you're already holding.
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
Probably because they have all the same
Damagevalue, the only difference is the value for thePotiontag inside thetagtag.