Custom theme messes up plugins?

Hi all,

I recently made my first custom theme for my website, http://clubpenguinmemories.com/ and I’ve already run into a few problems. It basically breaks three plugins of mine. The tweet button is slightly messed up, the page/post voting plugin does not display the stars to vote, only the rating it has based on X votes (see bottom of http://clubpenguinmemories.com/parties/ as example), and it breaks my lightbox image gallery plugin. Normally if you’d click on a picture on a page (such as http://clubpenguinmemories.com/penguin-chat/) it’d open it up in lightbox, but now it just opens the image in the same window. It also displays 1 image per row instead of 2.

Any idea why my theme is messing up my plugins?

Thanks.