Changing the category of a articles will make them appear on latest but only if they zero comments. I changed a few old articles that were uncategorized but I realized this was happening and I didn’t want to irritate other forum members so I just stopped. I don’t know if this is some kind of bug or not.
Thanks freyr. I wouldn’t be too worried about irritating people, because the posts will soon fall off the latest list again… and I do regard it as helpful to have the posts categorized.