Can anyone explain this ? I got so many marks from this question and all of a sudden it gets me negative marks. How come? How accepted is ‘f***ing’ in informal conversation?
The reputation table shows recent changes in reputation. The question has received two upvotes, which gives a +10 in the table (five rep for each upvote); the single downvote would give a −2 in the table because a downvote subtracts 2 from your rep score.
The reputation table does not show the resultant (total) rep for a question.
Here's an example, which happens to be mine:
The first answer is shown as −2, but all that means is that someone downvoted it, its current score is +2 votes, made up of +3/−1, so it's gained me 28 rep points.
The second answer is shown as +10 because it received an upvote. Its current score is +2 with no downvotes, so it's gained me 20 rep points in total.
There's a help page explaining how reputation works.