Wand Macro

Is there a reason why the following macro:
/cast Shadow Word: Pain
/cast Shoot
doesn't seem to be working? It just gives "Another action is in process" when I try to use it.
Is it just because of lag or what? I've used this same macro on BC servers and it worked fine. IE, I could hit the button once and it would cast SWP and immediately start wanding.
Here, I have to wait about 1/4 of a GCD before I can start wanding. I have to hit the macro twice, once to cast SWP, and again to start wanding.
/cast Shadow Word: Pain
/cast Shoot
doesn't seem to be working? It just gives "Another action is in process" when I try to use it.
Is it just because of lag or what? I've used this same macro on BC servers and it worked fine. IE, I could hit the button once and it would cast SWP and immediately start wanding.
Here, I have to wait about 1/4 of a GCD before I can start wanding. I have to hit the macro twice, once to cast SWP, and again to start wanding.