Confirmed, and I've found the cause.

Your fame is stored on the server, because other players need to be able to raise or drop it from anywhere. Every 15 seconds your client asks the server "what's my fame?" and overwrites the local number with whatever comes back. Quest fame, though, is only ever added on your own machine — it's never sent to the server — so within 15 seconds of finishing a quest it gets wiped back to the server's figure. That's why Character Info shows 0 even though the reward line said +1 Fame.

The quest data itself is fine: the fame amounts are read correctly from the original game files (Defeat Deo gives 6, Conclusion gives 12, and so on). It's purely that the number doesn't survive the sync.

The fix is to keep quest fame in its own running total that gets added back on top of the server figure each sync, and saved with your character, so it can't be overwritten and can't be double-counted.

Confirmed, and fixed. Your fame lives on the server, because other players have to be able to raise or drop it from anywhere. Every reconcile the client asks the server "what's my fame?" and used to overwrite the local number with whatever came back. Quest fame is only ever added on your own machine — it is never sent to the server — so within one sync of finishing a quest it was wiped back to the server's figure. That's why Character Info showed 0 right after the reward line said "+1 Fame". The quest data itself was always fine (Defeat Deo really does give 6, Conclusion 12).

The client now keeps track of how much of your fame the server has never been told about, and re-applies that on top of the server's figure after every sync instead of throwing it away. Gives and drops from other players still land in full, because those move the server's own figure. It can't double-count either: on the first sync after you log in, the difference between your saved total and the server's figure is treated as the local part, so a saved 5 stays 5 rather than becoming 10, and if the server is ahead of your save (someone famed you while you were offline) the server wins.

Verified with four scenarios: a +1 quest reward survives repeated syncs; a give and a later drop from another player both apply exactly once on top of quest fame; a relogin preserves the saved total without doubling it; and a server figure ahead of the save is adopted. Three of the four fail on the old code.