If the problem is noticeable in a browser the problem most likely lies in your code, not dreamweaver. What you see in the design view is almost never a representation of the actual view through a browser, especially with CSS and any includes.
Dreamweaver is a good program as long as you know how to code first, makes troubleshooting so much easier and with no browser standards troubleshooting is way too common.
You should post a bare bones file on the net so we can look at it through our browsers.
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