Hubber scores and hub scores normally fluctuate, increasing up and down on a seemingly daily basis.
To help increase your hubber score, you can participate more in the HubPages community by publishing hubs, asking and answering questions, posting in the forums, commenting on other people's hubs, etc.
Some of the factors involved in a hub's hub score include the overall length of the hub, your overall hubber score, and the uniqueness of the hub's content.
You can check out the learning center on hubber scores and hub scores for more information about this. Here's the link: https://hubpageshelp.com/content/Learning-Center-h... . Hope this helped.