I just cant understand how does it work. So, I have a macro binded on "F" key on my toons, and macro is: /assist Main_char_name

Basically, it works in like 60% of times.

On my main client I target a target and press "F" key so all toons must assist me but sometimes they just dont. I see on other screens that assist button is pushed but they somehow dont assist. When I press "F" key 2nd time - they assist. Same crap with AHK and Keyclone. Any ideas how the hell can I fix it?