Modify parameters of the search service of the demo with this parameters :

• Enable faceted search
• Display results : On this page, under search criteria
• Display : Choice lists only (as links)

Then, preview it :
Appears two list tags with the same class and the last class seems to be uncomplete :

<div class="facet facet-"><div class="facet-label">Diplôme</div><ul class="options facet-"><ul class="options facet-"><li class="option facet- facet-value-VE facet-count-1">