LI标签在IE中串行
以下代码第一行最后一个LI（1-8中的8）在IE浏览器中会下降一行，占用了第二行的空间位置。第二行LI标签（a-h）并没有串行。
请问这是哪里的原因？
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style type="text/css"><!--#c UL { DISPLAY: inline;}#c UL LI { BACKGROUND: #EFF7FF; FLOAT: left; WIDTH: 121px; text-align: center; margin: 1px; height: 21px; padding-top: 2px;list-style-type:none}--></style></head><body><table width="990" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#F47501"> <tr> <td align="center"><table width="100%" cellspacing="0"> <tr> <td bgcolor="#DDEEFF"><font color="#346F0E"><strong>标题</strong></font></td> </tr> <tr> <td><div id="c"><ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>a</li> <li>b</li> <li>c</li> <li>d</li> <li>e</li> <li>f</li> <li>g</li> <li>h</li> </ul> </div> </td> </tr> </table></td> </tr></table></body></html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style type="text/css"><!--#c UL { margin: 0px; padding: 0px;}#c UL LI { DISPLAY: inline; BACKGROUND: #EFF7FF; FLOAT: left; WIDTH: 121px; text-align: center; margin: 1px; height: 21px; padding-top: 2px;list-style-type:none}--></style></head><body><table width="990" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#F47501"> <tr> <td align="center"><table width="100%" cellspacing="0"> <tr> <td bgcolor="#DDEEFF"><font color="#346F0E"><strong>标题</strong></font></td> </tr> <tr> <td><div id="c"><ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>a</li> <li>b</li> <li>c</li> <li>d</li> <li>e</li> <li>f</li> <li>g</li> <li>h</li> </ul> </div> </td> </tr> </table></td> </tr></table></body></html>