I hope you are well today and thank you for your question.
I could confirm the issue on your shared website but it is working fine on my test website using the same navigation settings.
This can be due to plugin conflict on your site so please try temporarily deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
I could not reproduce the issue on my website.
Would you mind if I log in to your site and do quick troubleshooting? If this is ok then could you please temporarily create an admin user account and share me the account login details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able to see it)”?
Solution for this topic
I logged into your website and saw it was happening because you had enabled the theme “One Page Navigation” option which I have disabled now as shown in the attached screenshots and the mobile menu started working fine.
Could you please confirm it?