Anyone have an idea what's going on here?

I have a website with three variants... 960px, 640px, and 480px... Don't ask why!

The middle variant constantly changes all text blocks to CENTERED whenever I edit content in text in the other variants. Everything is the same but the 640px variant keeps having all the text in it (sometimes not all) move from LEFT justified to CENTERED.

I was not able to find anything here on the forum about this and cannot find a default setting that might be making this happen.

Help appreciated!

Thank you.