为什么会多出一个“个”zi

<table border="1" 
align="center"
cellpadding="0"
width="50%"
cellspacing="0">
    <caption>学生成绩表</caption>

    <tr align="center">
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>成绩</th>
    </tr>

   <tr align="center">
       <td>1</td>
       <td>小龙女</td>
       <td>女</td>
       <td>100</td>
   </tr>

    <tr align="center">
        <td>2</td>
        <td>杨过</td>
        <td>男</td>
        <td rowspan="2">90</td>
    </tr>

    <tr align="center">
        <td>3</td>
        <td>金论</td>
        <td>男</td>
    </tr>

    <tr align="center">
        <td>总成绩</td>
        <td colspan="3">190</td>
    </tr>