Do you have your macro setup like this:

[code:1]castsequence [target=NAMEHERE] [help] [modifier:ctrl] Healing Wave,,,,
[/code:1]
[code:1]castsequence [target=NAMEHERE] [help] [modifier:ctrl] ,Healing Wave,,,
[/code:1]
[code:1]castsequence [target=NAMEHERE] [help] [modifier:ctrl] ,,Healing Wave,,
[/code:1]

The position of healing wave needs to be different in the castsequence for each character's macro.