Unwanted and missing linebreaks

I am trying to setup a links page with linkview. Unfortunately I get an unwanted large space between the category name and no space at all between the last link of a category and the next one. I was not able to find where these spaces are set in the CSS nor in the html.
Do you have a custom CSS I can use to solve this issue? Thanks a lot.
Laura

The page I need help with: [log in to see the link]