I have bug in the game(I think that this is a bug).
When you move the camera by arrows,
if you press the arrow to the right or left while pressing the up arrow
and then release the buttons, the camera will continue to move upwards,
until you press the arrow down.
If you press the arrow up or down arrow while pressing the right
and then release the buttons, the camera will continue to move to the right,
until you press the arrow left.
I think when you release the buttons, the camera should stay.
And so for all directions.