Hi,

 

- select items,

- move them and slide them under a parent (with alt+right arrow),

- the grid focus moves (slides/moves) lower, towards to the bottom of the grid.

 

I don't know if it happens all the time, but it happens quite a lot, when I'm moving items around.

 

It also happens when marked items are put under an item : grid focus moves vertically (the vertical bar moves).

 

Thanks!