Content DIV overlapping both sidebars

Hi!

Almost a Zen virgin, even though I thought I knew css fairly well I have always trouble figuring out other peoples code.

I copied the starterkit as a sub theme and enabled it. Then I put some blocks to the left and right (first and second) sidebar so that they surely would show up. Now I have some content (navigation menu and stuff) in the left sidebar but the main content (middle) is NOT pushed to the middle and is just overlapping left (and right) sidebar.

So the content is not behaving according to ".sidebar-left #content-inner" even there is some things (blocks) in left sidebar. I manage to get the content to the right place when I increase the "paddin-left" in ".no-sidebars #content-inner". Is anything wrong or should it be like that, I thought drupal chooses automatically sidebar-lef or no-sidebars, but that doesn't seem to be the case.

I tried a another already made sub theme, same thing.