Minus 40 sounds like you have had 2 questions removed for rules violations.
Voting a question or answer up adds 5 points to their Reputation score.
Voting it down causes them to lose 2 points.
If a post is removed for violating the rules, they lose 20 points.
The rules are:
* You cannot post identifying information (Email, Name, Address, Telephone)
* You cannot use Ehelp to promote products or web sites.
* You cannot attack or abuse other members.
* Any other posts judged to be outside the intended purpose of exchanging useful information may be removed.