Hi everyone,
I don't know if there is an outstanding question here.
To summarize:
1/ People cannot earn points for things they do themselves:
- You can't like or rate your own content, therefore you can't get points for that
- You can mark your own answer as correct or helpful to help other members identify the solution to a problem, but you will not get the points for that. If you unmark the correct/helpful answer no points are removed.
2/ Moderators can mark anyone's answer correct or helpful, and thereby give the points to the author. And if they unmark it the points will be lost. In Saurabh's scenario here I assume he unmarked his answer and did not lose the points, and Julius must have thought there was a glitch and marked it again, for the second time, giving Saurabh the points again. I'm not sure because I may not see all the actions in the gamification platform (when someone marks/unmarks their own answer)
Bottom line, in very rare cases people will earn too many points, but we can always correct that if you want 
Laure