Question on a specific healing macro

[Vodomir]

All heals and buffs are cast on self, if there is no target selected or can't be applied on the selected target (not friendly npc).
I can't check right now, but there is probably a setting (there is one on most MMOs) where you can turn this self-cast thing on and off, since it is usually just a preference.

Good call, I'll check the game settings myself once I'm out of the office. If there is such a setting, that could very well be the root of the macro's misbehaviour.