DataTables ignore the Sort option from View Settings. This code fixes it.

gv-correct-datatables-sort.php

<?php //this entire line should be removed when copying this code, before pasting it into your functions.php file

/** Remove default order from DataTables */                                                                                                                                                    
add_filter( 'gravityview_datatables_js_options', function( $dt_config, $view_id, $post ) {
    $dt_config['order'] = array();
    $dt_config['stateSave'] = false;
    return $dt_config;
}, 10, 3 );