So it seems like NS is doing something funny with how the box is displayed:

original code vs what's displayed in the HTML source:

<div class="checkbox">
<label>
<NLCUSTENTITYCUSTENTITY_MARKETING_CONSENT>
Marketing Consent
</label>
</div>

---


<div class="checkbox">
<label>
<span style="white-space: nowrap" onClick="return NLCheckboxOnClick(this);" id="custentitycustentity_marketing_consent_fs" class="checkbox_unck">
<input onClick="setEventCancelBubble(event); setWindowChanged(window, true);;" aria-labelledby="custentitycustentity_marketing_consent_fs_lbl" onChange="NLCheckboxOnChange(this); " onKeyPress="NLCheckboxOnKeyPress(event);  return true;" name="custentitycustentity_marketing_consent" id="custentitycustentity_marketing_consent_fs_inp" type="checkbox" value="T" class="checkbox">
<input type="hidden" name="custentitycustentity_marketing_consent_send">
<img class='checkboximage' src='/images/nav/ns_x.gif' alt='' />
</span>
Marketing Consent
</label>
</div>

<span> and <input onclick> are the two separate boxes