Fromwien, the important thing is are you now happy that your points total is now correct with all the accidental unintentional discrepancies resolved.
I have tried to explain what I think happened:
(1) I accidentally hit "subtract" instead of "add" when you initially answered the question along with a lot of additional information
(2) I deliberately subtracted a point when I decided you had not fully answered my question
(3) I added the point back in when I had a complete answer
(4) When the discrepancy was pointed out I added two points to rectify action (1)
I have apologised for making a mistake. What more can I do? Apart, of course, from being more careful in future.