Help me understand this behavior:

If I click and drag on a column line, it doesn't change anything else in the
table. It just moves the line.

If I click on a row line, it moves the rest of the table up or down along
with the line.

How can I make the row lines behave the like the column lines? I don't want
the rest of the table to move. I just want to move the line.

Second question: sometimes when I click and move a column line, it 'breaks'
and I end up with different size cells. What causes this?

Thanks