I have created some categories and I have realized that the spaces between categories change according to numbers of articules inside. When the articles are more, the space between categories increases. You can see it in the attachment.. how I can resolve the problem?

What's the view you are using to display those categories?

i've attached a screenshot (sorry for my engllish)

The screenshot has very low resolution. I cannot read the link. Actually i only need the link field.