Wrong header on certain page :(

Hello everyone,

I have un big trouble on my website :

when you connect on http://www.cimayadev.fr/cfia-info/mag2-2 you have a navbar (which is a filter in reality) you can see that it’s work very well with the good header

BUT, when you connect on http://www.cimayadev.fr/cfia-info/archives-mag-1 you see that filters work great but with the wrong header …

How a can fix it ?

Thanks