iv been using a cast sequence macro

Code:
#showtooltip
/cast [modifier:alt] Amplify Curse
/stopcasting [modifier:alt]
/castsequence reset=combat/target Corruption,Curse of Agony
but when i edit it for my alt it only casts curruption
Code:
#showtooltip
/target focus
/assist
/cast [modifier:alt] Amplify Curse
/stopcasting [modifier:alt]
/castsequence reset=combat/target Corruption,Curse of Agony
what is going wrong?