acs; assessment;years of experience; dedduction

Hi, I have one "simple" question :-) Since when ACS deducts 2 years of experience? And is that always the case? Because I have 3 years of experience and that will be 5 points but if they deduct it then I'm on 0 points :-/ It is the dilemma... If I receive 0 points on experience then I'll...