I have a problem since you can not see the menu icon on mobile devices. I see the entire bar in gray, without the icon. Although if I click on where the icon should be, the menu unfolds without problems. the link is http://ingenioconsultor-cp5020.wordpresstemporal.com/plan-de-gobierno-2019/foros/
you don't have a Font-awesome lib loaded therefore the menu icon on mobile is missing. Please navigate to Dashboard > Forums > Settings > Features admin page, Enable wpForo Font-Awesome Lib, delete all caches and check again.