Without seeing the actual code, it's hard to say what's going wrong exactly.
Could you post a link to your site?
APDivs (css position:absolute divs) are by far and away the worst thing you can use to layout your website in DW. The vast majority of the time there is no need to deal with all of the inherant problems they bring to the party.
While the problems are not technically "errors" in how the position:absolute is supposed to work, a lot of their functionality is counter to the expected and takes a fair amount of research and understanding to get an APDiv based layout to function the way a designer would like.
