Accessibility problem - single checkbox has multiple label tags?

Hi,

I've noticed that on forms that contain a checkbox I always end up with two label tags - this is using Forms 2.0 embedding on non-marketo pages. This is a problem for me only in that I'm currently making accessibility fixes to a site - and the scanner reports keep complaining that the label is empty - even though the label I've input to marketo isn't - and only the second label in the html output is blank.

I'm not certain if it's a real problem for screen reader software etc...  vs being just technically wrong according to accessibility standards. However it does seem odd to have two labels for one checkbox - when it's not in a checkbox group where you'd expect that.

I've highlighted this below

<div style="margin-bottom: 10px;" class="mktoFieldDescriptor mktoFormCol">

  <div style="width: 10px;" class="mktoOffset"></div>

  <div class="mktoFieldWrap mktoRequiredField">

<label style="width: 180px;" class="mktoLabel mktoHasWidth" for="Opt_In_Consent__c">

    <div class="mktoAsterix">*</div>

    Opt in label text...

    </label>

    <div style="width: 10px;" class="mktoGutter mktoHasWidth"></div>

    <div style="width: 50px;" class="mktoLogicalField mktoCheckboxList mktoHasWidth mktoRequired">

     <input class="mktoField" value="yes" id="Opt_In_Consent__c" name="Opt_In_Consent__c" type="checkbox">

    <label for="Opt_In_Consent__c"></label>

    </div>

    <div class="mktoClear"></div>

  </div>

  <div class="mktoClear"></div>

</div>

I've noticed that in some of the form styles the second label is used to display a custom checkmark/checkbox graphic using css - instead of the normal browser defined checkbox. Perhaps this is just a result of that design choice...