strange macro bugFollow

I've been using the following macro:

/target [nogroup] pettarget
/cast [target=pettarget, exists] Kill Command
/cast [nocombat] Arcane Shot(Rank 1)
/stopcasting [nocombat]
/cast [nomod:alt, combat] Steady Shot;
/cast [mod:alt] Intimidation

I've encountered a strange bug with this. If I click the button too quickly and cast two steadies together without allowing an autoshot to fire, it will begin to /stopcast after every steady shot. So I am stuck firing steadies only, and autoshot never fires. The odd thing is, I break out of this by getting a critical hit with one of the steadies, triggering Kill Command. After that, autoshot will fire, I won't /stopcast, and the macro functions as intended.

I don't know if this is relelvant, but I only noticed this bug after installing Trinity Bars. I'd put the macro together very soon before, though, so it's possible I hadn't triggered the bug before installing the mod.

Any thoughts as to what could be wrong, and how I can fix it?

The macro does a couple things. If I'm out of combat, it will do a low threat pull - the "/cast [nocombat] Arcane Shot(Rank 1) /stopcasting [nocombat]" part.

If I'm soloing, it will autotarget my pet's target.

If Kill Command is ready, it will target my pet's target (if my pet is targeting anything) and cast KC.

If I hit alt, it will cast Intimidation.

But the usual use for it is just to use Steady Shot. If I am in combat and I have no modifiers pressed, it will simply fire a Steady Shot. In almost all cases, I can press this, wait for the Auto Shot to fire, press it again, wait for Auto Shot, repeat until dead.

The bug comes up when I press this, then I don't wait for Auto Shot to fire. If I press it too soon and my Auto Shot doesn't have a chance to go off before the Steady Shot cast time starts again, I will begin /stopcasting after every Steady Shot, until I get a crit and Kill Command can fire.

No idea why that is.

/shrug