If you look at Sitestats, the text for the labels is white. So you can't see it, but it's there. You need to hover over it to see it.
Taking a look at the CSS, it seems that it is getting overwritten by something in tool.css.
If you look at the first screenshot, you'll see that the css in tool.css for the color: #fff attribute is overriding the css for sitestats.css.
Also, once the text is fixed, there seems to be a problem with the padding too.