How come I got 3 "best answers" but I did not get 30 points added to my total points?

that has happened to me as well ,

one day i lost 8 best answers

they disapeared taking their points with them.

Maybe you did get the 30 points added -- but that would have been weeks ago. Your most recent best answer was 2 weeks ago! That's when you would have gotten the points added to your score.

That happened to me too, maybe you answered a lot of questions that you did not get voted best answer and so the more questions you don't have best answer, the less points you get for best answer I figured that out

I suspect that the same thing has happened to me at times. However, since the history list only contains six items, it's impossible to prove anything.

did you ask a lot of questions? That takes away points.

maybe because you ask too many questions

you have to consider the site your on ??????????????? besides,you only lost 30... i lost over 7000..... !!!!!!!!!

You did.