Sorry, the site is here:
http://www.riseprogram.com/rise_registration_form.htm

Apologizes, the labels in question shouldn't have an associated field. The orphaned labels in that form describe a list of radio fields. To fix them we recommend using an h1-6 tag instead. The tricky part is adding the appropriate h tag to any label styles that may already be present.

Jessica,

FormAssembly correctly associates the label element to radio inputs. For instance:

<input type="radio" id="red" ... /> <label for="red">Red</label>
<input type="radio" id="blue" ... /> <label for="blue">Blue</label>

The problem is that we also use the label element for the question, as in:

<label>What is your favorite color?</label>
<input type="radio" id="red" ... /> <label for="red">Red</label>
etc...

In this case, the accessibility validators will raise an error because the first label is not associated to any particular input.

I would argue that it's more of a shortcoming of the specifications than an accessibility issue, since the label tag is the most semantically appropriate element here. For instance, if we had a free text field or select input, it would work just fine:

<label for="color">What is your favorite color?</label>
<input type='text' id="color" ... />

In any case, if passing the automated accessibility tests is a requirement, as Zon suggested you should change the markup.
For instance:

<h4>What is your favorite color?</h4>
<input type="radio" id="red" ... /> <label for="red">Red</label>
etc...

No need to apologize, it wasn't exactly clear what we where talking about in the first few messages...