Hi, you just need to indicate in your template configuration the ‘home-style-2’ to make menu open like our demo page.
In our demo page, the error you mentioned its not a error, but we only indicate this styled mentioned above in the page home>vertical menu
I have put this style assigned to all your mainmenu pages, if you need more assistance, let me know!
PS. In time: you have a lot of styles assigned with your menu buttons, if in some page you see another color or menu position, look at your template config and see if there are a different style assigned to that button and correct (you can put all your styles to ‘home-style-2-test’ I created (rename if your desired name)