I forgot to increment x in the loop. Here is a revision:

var gr = new GlideRecord('sysapproval_approver');
gr.addQuery('document_id',current.sys_id);
gr.query();
gs.print('Found ' + gr.getRowCount() + ' records.');
var x = 1;
while (gr.next()) {
    gs.print(x + " - Approver : " + gr.approver.getDisplayValue() + ", State : "+ gr.state );
    if (gr.state == 'Request Approval') { // make sure this is the real value
        gs.print(x + " - Changing to requested.");
        gr.state = 'requested';
        gr.update();
    }
    gs.print(x + " - gr.sys_id : "+gr.sys_id );
    x++;
}
current.u_mr_state = '2';
current.approval='requested';
current.update();
action.setRedirectURL(current);