Hello Daniel,
Your code is broken. Most of the tags were unclosed. You are going to resolve it by ensuring that the html code is correct. You may use this code instead:
<div class="Detailed-Header-Group">
<div class="col span_1_of_3">
<b><font size="5">[202]</font></b>
</div>
<div class="col span_1_of_3">
<b>Valid From</b>: [204] at [205] | <b>Valid Too</b> [207] at [206]
</div>
<div class="col span_1_of_3">
<b>Status</b>: [200]
</div>
</div>
<div class="SYN">
<div class="col span_1_of_1">
<strong>Synopsis:</strong> [201]
</div>
</div>
<div class="Second-Last">
<div class="col span_1_of_2">
<strong>Changelog:</strong>[231]
<strong>Issued By:</strong> [230]
<strong>Created:</strong> [created-at]
<strong>Updated:</strong> [updated-at]
</div>
<div class="col span_1_of_2">[if 198 equals=""]
<a href="https://metcast.net/wxdata/placeholder.png"><img src="https://metcast.net/wxdata/placeholder.png" alt="placeholder" size=thumbnail></a>[/if 198][if 198 not_equal=""]<a href="[198 size=thumbnail]"><img src="[198 size=thumbnail]" alt=""/></a>[/if 198]
</div>
</div>
<div class="Last">
<div class="col span_1_of_1">
[if 230][editlink location="front" label="Edit" page_id=3094][/if 230]
</div>
</div>
And when you insert the code, please make sure that you are using the HTML view and not the Rich Text view.

Please let us know how it goes.