When you add a new experience item, education item, answer, etc., to your careers profile, it gets added at the end. Assuming profiles are progressively updated over time, this implies that the intent is to list in chronological order (or play whack-a-mole with the reorder arrows).
In employer view, lists of sufficient length are truncated. Presumably, the most important information is displayed, with more detail available by clicking "display x more...". Generally, the most recent items are the most important for employers to see. This implies the intent is to list in reverse chronological order.