Agree for that .
As my little experiences in Dreamweaver, Dreamweaver itself has some tricky steps to follow .
I crated my web in Dreamweaver and it show not correctly position also.
What you may try is check all code, It may help .
It may be due to some miss places of some codes.
Anyway after I finish code in Dreamweaver I use 3 Web browser ( IE, Chrome and Fire fox ) to check .
And I use CSE HTML Validator to recheck for final.