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Bassman I suppose, that You defined a width of your cl and cl blocks as 50%. So if centerColumn is 4e 500px width we got 250px for each of center blocks (e. cc block, that is 100% w.).
If the content is widther than those 250 your blocks and columns will be pushed on right.
See what happened if you put a image widther than yout lefl colum! It's the same!
The problem is allways in the templates, if yours templates have width, that is in the code defined as widther tah yours collums or block, you will see a mess on your page.
Remember, that lots of developers creates a modules just for a default theme.
regards!