Classified ads, as it tells in the subforum, have to be approved by a site team member before showing in the forums. Since ALL posts are sorted by date/time of the original post (which in a classified ad would be the time it was submitted for approval). then once it is approved, it will be listed in the forums as of the time it was submitted (not approved).
Ex: A classified ad is submitted at noon. It is approved at 5PM. It will show up in the forums as being posted at noon, and will be behind any other forums posts that were done between noon and 5 PM in a descending order. If there were 100 other posts in that time frame, then the classified ad would show up as the 101st.
2011 Flagstaff 831 RLBSS
I've reported my DNA missing just in case it's found somewhere bad.