Hi Michael,
There is padding top set for the mainbody on your site:
@media (min-width: 768px){
.t4-main-body {
padding-top: 3rem;
You can share the super admin account of your site so I will check if there is setting for this in layout.
Or you can override it with this custom CSS rule:
@media (min-width: 768px){
.t4-main-body {
padding-top: 0 !important;
}