Karla: YES!!!! That was the whole problem. I have spent a week breaking my head (and looking at more than 20 videos) and could not find the answer.
TANK YOU VERY VERY MUCH for your help.
Gilbert: thank you very much for your prompt answer. I am very troubled about this.
I checked the header builder: it has 3 lines. In the middle one I have the logo at the left side and the Primary navegation at the right side.
I also checked that the menu is asigned at the Primary navegation, wich might be seen at the Mobile Trigger.
