Please post a link to the page so we can see what is happening.
Any effect like that would be a direct consequence of the code on the page - by giving us a link, you allow us to examine that code.
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The site uses absolute positioning. It will only appear centered on screens identical to yours.
The reason that happened is because you used position:absolute in your css for your page elements. Position:absolute pulls your content out of the normal flow of a page and places it a set number of pixels (as set by the top and left css attributes) from the top left of the browser window.
On screens larger than yours (like mine) the site appears off center to the left. On smaller screens than yours, part of the design will fall off the right of the monitor, requiring a horizontal scroll bar.
You'll need to go through and remove your absolute positioning (no position attributes are generally necessary) and position your content using css floats, margins and padding...