The Split template https://split.super.site/ was built before the Super Footers were available.
To get the footers working properly, please add this CSS code to get the footers working with the Split template (but only when the header image is on the left).
@media (min-width: 1021px) {
.super-content.max-width.has-footer {
margin-left: 50vw !important;
}
.super-content {
position: initial!important;
}
.super-footer.stack {
margin-left: 50vw !important;
}
}