I'm on Linux, so can't check that site in IE.
I do see some MS Office CSS code that Firefox doesn't support, so that can be an explanation.

<table border=1 cellspacing=0 cellpadding=0 style='border-collapse:collapse;
 border:none;mso-border-alt:solid windowtext .5pt;mso-padding-alt:0in 5.4pt 0in 5.4pt'>

  </td>
  <td width=391 valign=top style='width:293.4pt;border:solid windowtext .5pt;
  border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0in 5.4pt 0in 5.4pt'>

Things like this happen if you use MS software to create web pages and don't check with other browser how it looks.

Thank you for your feedback. Any suggestions on how I can fix this?

Barakaat

http://jamesgraves.com

Try using a program that creates web pages to W3C standards, like this:
http://kompozer.net/