After reading the hilarious "Online Dating" thread, it's obvious some need an area to post their wants and needs for "Outdoors Singles & Adulterers"!
On a more serious note, the search routine for "New Posts" isn't functioning correctly. Seems as if the algorithm is not digging down through the stacks of all daily posts and is limiting it's searchable records to only a few in each category/sub-category. Is their a limiting function (or hardware) to the working space allocated within which the daily records are collated then searched for chronology? Or, are they searched in-place and indexed, collated, then returned to the output web pages? Or, is there a different type of routine being employed? How do the daily records or new input stacks and queues allocate space for the incoming records, how do they sort and how do they flag the dates? There are other possibilities and questions, but these are a start. David probably knows where to look already.