html marked shouldn't be in the plain textarea.
<table class="glm-admin-table glm-admin-table-inner">
<tr>
<td {if $contactInfo.fieldFail.notes}class="glm-form-bad-input"{/if}>
- <textarea name="notes" value="{$contactInfo.fieldData.notes}" class="" placeholder="Test">{if $contactInfo.fieldData.notes}{$contactInfo.fieldData.notes}{/if}</textarea>
+ <textarea name="notes" value="{$contactInfo.fieldData.notes}" class="" placeholder="Test">{if $contactInfo.fieldData.notes}{$contactInfo.fieldData.notes|strip_tags}{/if}</textarea>
{if $contactInfo.fieldFail.notes}<p>{$contactInfo.fieldFail.notes}</p>{/if}
</td>
</tr>