The datestamp at publication on posts is what determines the order. The date is embedded into the URL for every post. Marking them as sticky posts sticks them to the front pages but dies not change the datestamp. If the posts have been indexed by search engines then editing the datestamps is not a wise course of action and this article explains why that it is > Avoid creating 404 pages
Your blog is indexed by Google (12 results).
Your blog is not indexed by Bing.