I quite often face this strange WordPress page/post formatting problem. Today I encountered it on this Comedy Movies blog.
Firstly I upgraded to WordPress 3.1.3 and then when checked the page I saw it has formatting issues. See image below how it looked.
The problem might be with the theme code. So before you disable WP Minify try to debug the theme code first.
To do so grab the source code of the distorted page and paste in Dreamweaver. Then check for any missing DIV or any other problem with closing tag. In some case I find that closing DIV tag is missing.
If above doesn’t solve the problem then disable the CSS Minify option from WP Minify Admin control panel.
After changing settings you will have to clean Cache if you are using any Cache plugin.
If nothing works then the problem is with your page template file.