query about win Explorer window

Just wondering if anyone might have an explanation for this:

I set the Windows Explorer window sized to show the contents of a folder in list view and 25 items shown in a column. Yet for some folders, I have noticed that more then 25 items have been displayed in a column yet the size of the window has not changed.

for instance I have a folder that contains 130 items and it displays 5 even columns with 26 items in each column when it should be displaying a total of 6 columns, with the last column having 5 items in it. Without changing the size of the window, I view another folder that has 107 items, it displays 5 columns, 4 having 25 items, and the last column having 7 items.

What I see, the size of the program's window is not dynamic, does not automatically change based on the contents. The size of a panel within that window does not change but scroll bars should appear when there's too much data to display in that panel.