Hi Shania,
To begin with, can you go to Appearance > Customize > Additional CSS and remove these?:
.site-branding,
.site-logo {
position: absolute;
left: 50%;
transform: translateX(-50%);
z-index: 200;
}
.main-navigation .menu-item-separator a {
font-size: 0;
background: transparent !important;
}
#site-navigation {
float: none;
width: 100%;
}
Then, can you provide the link to the site in question?
You may use the Private Information field for this: https://docs.generatepress.com/article/using-the-premium-support-forum/#private-information