I'm a CX Gold (4th on the list) and I get lots of long haul upgrades without really trying very hard. So it's no surprise that a QF Emerald would catch one every now and then.

63 is actually a pretty decent BN considering there are a few hundred on your flight. Assuming you fly in J please take a walk through the W & Y cabins to see if they are full enough to cause you to be op-upped. If they have lots of empty seats, then it must be a computer glitch or an artifact of your DONE3.