Table has some tr with bigger height
<p>As you can see in this fiddle 
<a href="https://jsfiddle.net/vaL9Lpqm/" rel="nofollow noreferrer">Fiddle</a></p>

<p>The table starts with all the rows having the same height but later they have bigger heights, why is that?</p>

<p>This is just some portion of the table, please check the fiddle</p>

<pre><code>    &lt;table border="2" cellpadding="0" cellspacing="0"
 height="190"&gt;
    &lt;tbody&gt;
      &lt;tr bgcolor="#ffffcc"&gt;
        &lt;td class="Normal" style="width: 116px;"
 height="16" valign="top"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 face="Arial, Helvetica, sans-serif" size="2"&gt;
        &lt;span
 style="font-size: 10pt; font-family: Arial; color: blue"&gt; &lt;font
 color="#000066"&gt; FECHA&lt;/font&gt;&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
        &lt;td class="Normal" height="16" valign="top"
 width="90"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 face="Arial, Helvetica, sans-serif" size="2"&gt;
        &lt;span
 style="font-size: 10pt; font-family: Arial;"&gt; &lt;font
 color="#000066"&gt;Número&lt;/font&gt;&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
        &lt;td colspan="3" class="Normal" height="16"
 valign="top" width="357"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 color="#990000" face="Arial, Helvetica, sans-serif"
 size="2"&gt;&lt;span
 style="font-size: 10pt; font-family: Arial; color: blue"&gt; &lt;font
 color="#000066"&gt;Variaciones&lt;/font&gt;&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
        &lt;td class="Normal" style="width: 116px;"
 height="22" valign="top"&gt;
        &lt;div align="center"&gt;&lt;/div&gt;
        &lt;/td&gt;
        &lt;td class="Normal" bgcolor="#ffffcc"
 height="22" valign="top" width="90"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 color="#000066" face="Arial, Helvetica, sans-serif"
 size="2"&gt;&lt;span
 style="font-size: 10pt; font-family: Arial; color: blue"&gt;Indice&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
        &lt;td class="Normal" bgcolor="#ffffcc"
 height="22" valign="top" width="357"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 color="#000066" face="Arial, Helvetica, sans-serif"
 size="2"&gt;&lt;span
 style="font-size: 10pt; font-family: Arial; color: blue"&gt;Mensual&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
        &lt;td class="Normal" bgcolor="#ffffcc"
 height="22" valign="top" width="357"&gt;
        &lt;p style="" align="center"&gt;&lt;strong&gt;&lt;font
 face="Arial, Helvetica, sans-serif" size="2"&gt;
        &lt;span
 style="font-size: 10pt; font-family: Arial; color: blue"&gt;Acum.
del Año&lt;/span&gt;&lt;/font&gt;&lt;/strong&gt;&lt;/p&gt;
        &lt;/td&gt;
</code></pre>