I guess it is not intended, that XPOrbs spawn after a bottle of enchanting is thrown 3 blocks away from the impact position.
Relates to/ is caused by:MC-12013
This was in earlier versions:
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Intended.
Please refer to the GIF: http://minecraft.gamepedia.com/File:Bottle_O%27_Enchanting_Splash.gif?version=50d842c145c5460f7f1ee3521675cbd3

Maybe it is just because the XPOrbs won't show instantly so they are moving away, but we only see them 3 blocks away and not the progress of moving (shown in this gif)