Inflation of "Karma" on a geek magazine

I noticed here recently that without changing the votes for my karma, its significance fluctuates. First, she moved to zero (increased). Naturally rejoiced, even though the fluctuations were small.

There was a hope to someday be in the black, and will learn to rate articles and topics in blogs again.

But today I noticed an undesirable movement towards minus infinity. so sad. Can you tell me my friends why this is happening?