You need to be careful in wording things when trying to describe your problem.
By macro do you mean key map with multiple steps? Do you mean a key map that has one step with that first calls the FTL Assist and then calls another key map that does chain heal? You have ctrl-num1 listed but mention ctrl-num3.
The reason it's chain healing themselves is because you have an option in WoW enabled that auto-self casts if the current target is not helpful (if you're targeting an enemy and hit chain heal then it will just cast on the player).
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