Sticky header menu not displaying right

Hello everyone,

I really really NEED HELP ??

I managed to put the right code to get my menu sticky but when I do it the display is totally wrong. The sections of my menus are displayed in the wrong order and are written on top of each others – instead of forming a simple line.

What can I do to get a sticky menu looking exactly like my current header menu?

Thank you very much in advance for your help ??
Best regards,

Les Vaillantes

The page I need help with: [log in to see the link]