ToME: the Tales of Maj'Eyal

I've just checked the achievements screen in my current game. Last time I did it (with my previous characters), I saw all achievements, those of the current character and those of the former ones (provides the "all" checkbox was checked, of course).

Right now, I seen only 4 acheivements : one from my current character (Arena), three from the former one (Exterminator, The Right Thing To Do, Thralless)
He had much more as you can see here : http://te4.org/characters/161099/tome/5 ... b43e96661c (btw he died when I was offline, so it appears that his last moves have not been saved).
All the other achievements except the 4 mentionned above, are gone.
Why is that ?

I'm guessing it does the achievements upload when your character dies, which if you are offline doesn't work.
Or maybe it just hasn't synced yet.

No, the data displayed on the ToME site is correct. It is the achievements screen on my desktop that is now missing most of my former achievements.