Vlk
2
Please try again;
It takes about 20 minutes to fully update all our download servers; the servers are chosen randomly when you are updating avast. And you had the luck to be one of the first - you know, we have just released the Dec2003 update…
So it’s likely that the info that something’s new was received from one of the servers that were already updated, and the updater itself chose a different server that still didn’t have the latest data…
Nice! 
Vlk