I found some bug about this problem, it becomes skill or common event, but where is thos bug, i want still use skill or commond events in skill attack...
I noticed that the monster group work with basic attack, but for example, but b- & c-monster do not use ther own skills & if they using, they do that a -monster through.
Just:
1. Turn: A -monster attack
1. Turn: B -monster use skill attack -> A-monster attack
A -monster can use any of skill or attack type, but no other monster...
or
1. Turn: A -monster attack
1. Turn: B -monster use double attack -> B -moster do first hit & then use skill attack -> A-monster attack...
Other monster use A -monster when they use skill attack...

Also most of my skill attack use common events...
Like this: " Force action: [1.], Attack Random "
& in skill system Scope is set: All Enemies... & still not work right...

I'm just doing something wrong or set someting or make event to do about that then A -monster attack only.