Sudoku is solved without errors, but game doesnt recognize it, game doesnt stop

Game is solved as you see on the screenshot. But if I exit the game and load it, 5 squares aren't filled.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-sudoku 1:3.2.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Wed Nov 2 19:39:01 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-games
UpgradeStatus: No upgrade log present (probably fresh install)