I’m experiencing the same problem.
The form displays ok when the labels are set to appear on top but when you change the setting so that they appear on the left, then the radio buttons appear inside a label div.
Label code:
<div style="width:138px; text-align:right; float:left; clear:left; padding-top:8px; padding-right:10px;">
<label>Type of Enquiry:</label>
</div>
Radio buttons:
<div style="width:138px; text-align:right; float:left; clear:left; padding-top:8px; padding-right:10px;">
<span style="white-space:nowrap;">
<input type="radio" style="width:13px;" id="si_contact_ex_field1_10_1" name="si_contact_ex_field10" value="I Require a Sales Exec Visit" />
<label style="display:inline;" for="si_contact_ex_field1_10_1">I Require a Sales Exec Visit</label>
</span>
</div>
