If I have 4 items, they are displayed correctly using 'Automatic' column span :
but if I have 5 and using 'Automatic' column span, there is a gap :
The same thing if I have 6 items or 7 items :
So, if I have an odd number of items, there is a gap, but not for even number.
Is there a way to display properly for an odd number of items ?