it is reported here 2 years ago and still not fixed

http://brainking.com/en/ReadBug?bgi=1640

and the game position

Fevga (Gror vs. Resher)

basplund: ok, but bug or not there should be the option to offer what amount of points you wish to resign by, when the resignation offer is sent, like in live tournament play, then it is up to the opponent to decide whether to accept or decline.

basplund: in my opinion you should have got 3 points for that game, i assumed thats what you would have got when i resigned, i'll resign a gammon game next to put it right.