you go to style templates then edit the template your using and then about half way down there is a radio check box that says
Table Border Display Type:
If using visible table borders, you can control the way the borders are displayed. There are three options.
X:outside borders visible only.
X:Borders outline entire table, inside and out.
X:Borders inside and out, but with a thicker outside line.
you want to choose the middle one boarders outline entire table, inside and out
