Hubber scores normally fluctuate up and down. Sometimes, they can increase or decrease or even stay the same for a while. To help increase your hubber score, you can comment on hubs, ask and answer questions, post on the forums, publish hubs, etc.
To learn more, you can check out the learning center guide on hubber scores. Here's the link: http:// hubpages.com/learningcenter/hub score-hubber-score