Unless you provide a link to a page demonstrating the problem, no one will be able to offer much in the way of assistance.
(oops – sry! the wheel is turning but the hamsters dead)
http://grennanmill.net/wordpress/
The third post is not in the div with an ID of “home_content_wordpress”. You probably forgot to properly close a div somewhere in your theme’s template files. Validation doesn’t seem to work on your website: http://validator.w3.org/check?uri=http%3A//grennanmill.net/wordpress/ because of this div: <div class=�comments-template�>. Replace that with: <div class="comments-template">
Thanks for the help keesiemeijerz, I checked down thur the file and removed some </div> that the validator was showing up, unfor Iam not too sure of the other errors which would be causing the third post offset. I dont understand how this could happen either as I thought all the posts are contained within the ‘default’ loop settings?