Weird stuffs happened with "Quick" spell

I think most people notice the real reason why "Quick" spell is broken. Not because it give 2 turns or bypass enemy's counter, but for several weird reasons that I want to fixed or removed.
1) #4 character ATB sometimes still full
2) Enemy does not take action after Quick spell resolved for a while. More likely if the 2nd turn by Quick did not attack them. 
3) Many turns can passed with the #1 character never moved. 
4) #3 & 4 characters take actions the most due to Quick spell.

Anyone know why & how do I fixed this issues. I really just want Quick to give "2 turns only", not these broken benefits mentioned above. Tq.