I have a flight Friday and when I checked the upgrade list this early this morning I saw that FC had been booked 5 of 16 with two upgrades confirmed. Well I just rechecked an hours later as I had the app still open and now it says "Full" with seats in the seat map still showing. I also noticed that the standby list says "Full" in both economy and first.

My question is United that good to book 11 people into FC in 1 hour or is this a case of economy being severely overbooked and they're blocking FC seats?