I activate on test site the Sticky Navigation for Mobile and Desktop and it works fine.
Trying to activate on live site, same configuration (well, test site is 98% equal), only the mobile is working.
I cleared cache from browser test on another browser, still not working. I have no error in the browser console.
It works now. I am terribly sorry for keeping you busy for nothing. I really can’t say what or why it’s working now.
Thank you so much for you fast response. Very good service.