ok - does it do this when you click on the link in your e-mail saying someone has posted?
If so, it is taking you to that post, which would usually be the last one - unless others have posted after it - but it would still take you to that post, not the top of the page.
If you just click on a thread from within the site it shouldn't do that.
Is that what's happening?
"Count yourself...you ain't so many" - quote from Buck's Daddy