Originally Posted by brandx
you probably pressed back browser and filled it in again.. when u finish a puzzle press new game or solve another puzzle to begin a new game.
That would make sense, but I never use the back button as I'm well aware of the problems it can create. It has appeared after every one of the 30-odd puzzles I've completed.
Mikiboop is right though, it doesn't really matter. It's just a little confusing as it doesn't even give me a message saying I've finished the puzzle.