When you say "some used the wrong neutral when" do you mean someone
might have used a neutral from a different circuit?

I didnt wire this light - it was here when we bought the house, so I
have no clue how its done.

If this is the case - how could I go about fixing it?

Replacing all the outlets would be expensive up here in Canada (15
bucks a shot), and there are alot of outlets, so I would like to avoid
that if possible.

Thanks