Can anyone help me troubleshoot a macro that buff the party?

Hi everyone!
I'm trying to write a macro that buff the party in 5 clicks on the same button.

the method is use castsequence and no action in many position.
each time it runs, only one slot is active, so it should only trigger one cd and should be able to go on.

/castsequence [@player] Power Word: Fortitude,,,,
/castsequence [@party1] ,Power Word: Fortitude,,,
/castsequence [@party2] ,,Power Word: Fortitude,,
/castsequence [@party3] ,,,Power Word: Fortitude,
/castsequence [@party4] ,,,,Power Word: Fortitude


yet somehow this macro doesn't work as expected. it cast on myself successfully, then sometimes cast on one or two member, but never the full party.
I'm pretty sure the member are within the range.

I'm very confused and can not figure out why. Any suggestions? Thanks!

oops... sorry I meant to post this in general discussion. somehow ended up in here... probably I clicked the wrong link previously.

Castsequence isn't like that.

would work something like this:

#showtooltip
/castsequence reset=15 Inner Fire, Prayer of Fortitude, Prayer of Spirit, Prayer of Shadow Protection

Also, didn't get to castsequence to have different targets.