This table only has 14 rows and 5 columns. There is some extra space at the right and at the bottom, but that is not an extra row or a column. That is equivalent to what happens when you create a new table and then add a single row and column, for example -- you'll notice that the table is still larger than the one cell you end up with, and this space is visible. It's just extra space that you can get rid of if you make the table smaller, for example.
A quick way to make your table fit an exact number of rows and columns is to edit the table, click on the Size/Scroll Options button, then set the Number of Visible Rows to 14, and the Number of Visible Columns to 5.
Hope this helps
Luis
NI