T-24h: Checked into a TPAC flight, GPU hadn't cleared so I was put on the visible standby list. I'm 2nd on upgrade standby and no one has been upgraded (as far as the confirmed list says).
T-20h: Had a look on the list again, I'm now 4th down, still no one upgraded.
T-19h: Get an email from United saying my upgrade cleared. Looking back on the upgraded list, there's a total of 2 people upgraded, me being the second. On the standby list, I see people still waiting who were previously ranked above me.

Any explanations on what happened here? It was my understanding that even if R space opens up, the pecking order should still take the first people off the upgrade standby list.