Illogical rectangle movements in field-to-field navigation

Please watch the video in attachment for better understanding. 

qtdesignstudio_7xK7zpIHyj.mp4

When user presses up-arrow key while the rectangle is on the 4KArrow -texture, the rectangle jumps to material 1 and not on to the material 15. It would be more logical, if it jumped to material 15.