Hello, in this tutorial http://ui-grid.info/docs/#!/tutorial/Tutorial:%20301%20Edit%20On%20Focus I think correct behavior of program should be that after I move with tab/left/right focused cell should stay in edit mode, but unfortunately it doesn't.
Steps to replicate on your preview:
dblclick on any number in age column (it should be in edit mode) -> after moving right with right arrow, cell next to the previous one is focused but not in edit mode, (probably because of horizontal scroll bar moved)