OP, Welcome to FT! There have been a number of comments recently reporting a glitch in how the upgrade & standby lists display. It seems sometimes there are confirmed passengers awaiting a seat assignment who "appear" to be ahead of those listed for an upgrade, though the former are most likely awaiting a seat in coach and aren't on the upgrade list...if that makes sense.

The website list & mobile app lists are reported to appear differently due to this glitch, and at the moment I can't recall which is said to be more accurate. Perhaps others will weigh in & direct you to which list will give you a better picture of your spot on the upgrade list.