Error on rule for label input

[daopapp]

Hi,
Sometimes I've got this error:
"Incorrectly positioned label elements"

But if I get the html and use the html checker, this error appears fixed.

I'm using this div for labels and inputs:

EX: https://varsovia.embaixadaportugal.mne.gov.pt/pt/sugestoes-elogios-ou-reclamacoes

<div class="control-group"><label id="jform_contact_name-lbl" for="jform_contact_name" class="hasPopover required" title="" data-content="O seu nome" data-original-title="Nome"> Nome<span class="star">&nbsp;*</span></label>
                    <div class="controls"><input type="text" name="jform[contact_name]" id="jform_contact_name" value="" class="required" size="30" required="required" aria-required="true"></div>
                  </div>