In default language registration page Can Be Shown field as list or set of radio buttons with Flags (configurable)

[vBET]

So most probably during customization someone broke your template. Please show me how your registration template looks. Also note that registration template should include this: $customfields_profile. If not - it means that you have broken template - please compare it with original version and include necessary part. This is required part from original template:

<if condition="$show['customfields_profile']">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
	<td class="thead">$vbphrase[additional_required_information_profile]</td>
</tr>
<tr>
	<td class="panelsurround" align="center">
	<div class="panel">
		<div style="width:$stylevar[formwidth]" align="$stylevar[left]">

			$customfields_profile

			<if condition="$show['birthday']">$birthdayfields</if>

		</div>
	</div>
	</td>
</tr>
</table>
<br />
</if>

[jorgejgm]

Fixed, thanks.