Active field is not refreshed when moving too far to the right

I edit the Sudoku array with keyboard.
If a cell at the right border is active and I try to move one more cell to the right,
then moving up and down does not move the active field.
However, if I then move to the left then the field activation jumps to the according row.

The other borders do not have such a problem.

I assume that the program does not correctly catch if I move the cursor too far to the right.
Certainly, the position is left larger than allowed and thus the new activated field is not shown.
If I move to the left again, then the position becomes valid and is shown.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-sudoku 1:3.18.4-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Jul 30 09:04:46 2017
SourcePackage: gnome-sudoku
UpgradeStatus: No upgrade log present (probably fresh install)