Why when I win 7-0 and my opponent leaves the game , is it reported I won 2-0 and I gain only 5 poin

I just played a game of 2 ends, winning the first end by 4, losing the second end by 1, why does it

Rules of curling

Totally agree, players doing that should be penalized. Happens to me all the time. Just sinister ply

Yes many people do that when losing to minimize their loss