Per a comment, the problem was due to the use of query_posts which clobbers the main query.
It should be noted that using this to replace the main query on a page
can increase page loading times, in worst case scenarios more than
doubling the amount of work needed or more. While easy to use, the
function is also prone to confusion and problems later on. See the
note further below on caveats for details.http://codex.wordpress.org/Function_Reference/query_posts (emphasis mine)
In addition, it overwrites $wp_query which the main Loop on the page uses.
If you need additional loops use a new WP_Query object, not query_posts.