Building problem page

Hello
I built a display page and administrator all OK but when I see the visitor page it goes I’ve done 2 times 6/12 and 4/12 but on the visitor page it gives me I reverse the 4/12 and 6/12.
Page => http://sebr.fr/cpbvrc2/ecole-de-pilotage/
Administrator

Visitor

Thank you for your help.