The problem is here
/**
* Redirect
*/
if (get_field(‘general_redirect’, $bifrost_queried_object) && get_field(‘general_redirect_url’, $bifrost_queried_object)) {
wp_redirect(get_field(‘general_redirect_url’, $bifrost_queried_object));
exit;
}
You are attempting to redirect after HTML output has been started. This code needs to happen before
<!DOCTYPE html>