I noticed this too - I completed one or two Axis campaign maps, and got the "complete the whole campaign" for the current skill, and the one below. When playing tonight, I got the "campaign completed!" screen flash up quickly, just before the second tutorial mission (sqaud command) was started, i.e. still pretty close to the beginning of that campaign.
2100.00% accuracy? that's German efficiency for you.
268 kills, 4000 points... the most productive 5hr I've ever had with an online videogame
Weird ..Don't remember killing any tank since Beta ended
Bring in more cartoons
Ok this is getting stupid. I just played on an official TWI server and my stats actually updated. BUT: additionally to the correct tracking of the weapons I played with I supposedly have kills with weapons I never even used before (AVT-40, DP-28), classes I only played for a few minutes and only got 1 or 2 Kills or never played at all progressed, I have 20 Tank kills according to my profile but I never destroyed a single tank after the official release...
Aaand an accuracy of 4266,66% with the scoped Kar98 (The Number of Kills is about right though):
Could it be that, the stats are saving just fine - but the game is accidentally showing you somebody else's stats and not your own? Mine says my favorite gun is an MP40, but I've never used one...