Hello thanks for your reply ! Yes i didnt set that (on purpose) to the master header, because there is element that are different in each page (like links and behavior) !
For the solution of having a non sticky solution , i did tried that before, but the idea was to go on the top of the section, so technically i can manage to do that with a bar hidden at the top of each section ! The strange thing is that on mac ( Chrome) , there isn’t this problem, but in windows (still chrome) there is !