Same macro for 6 spells. 4 works on the character Unit frame, 2 don't

I have the following macro for 6 healing spells

#showtooltip
/cast [@mouseover,help,exists] [@target,help,nodead] [@targettarget,help,nodead] [@player]

and the spells are Lesse healing Wave, Healing Wave, Reptide, Chain Heal, Earth Shield and Cleanse Spirit.

With Lesse Healing Wave, Healing Wave, Reptide and Cleanse Spirit the mouse over works perfectly. i can mouse over the character or its frame unit and the spell is casted.

But with Chain Heal and Earth Shield, the mouse over just work on the character but on the unit frame does not work. this is a problem to me in dungeons since i use Grind addon to heal and when i need to use this spells i have to select the character or find him in the midst of the battle to mouse over him.

anyone can help me pls