Print preview doesn't work properly in Excel 2010

Hello all,

First I made some contents and drew a border from Home > Font > all Borders on an Excel 2010 file. So it became like below image (capture1). After that I wanted to print it so went to File > Print to see its preview. But the problem is that the lines between tue and wed and also between mon and tue are not shown neither in preview nor when printing. The height of row 7 until 17 is 24 (that is 32 pixel) but heights of the rest of the rows are normal (20 pixel).

Any idea about why those lines aren't shown?