Fix

resources/views/app/my-account/admin/orders/sub/template/invoice-order-detail.blade.php

@@ -88,7 +88,7 @@
                     <tr height="28">
                         <td align="right"
                             style="color:#000;font-size:14px;font-weight:400;padding:0 30px 0 0;border:none;border-width:1px;border-color:rgb(238,238,238)">
-                            Sub Total</td>
+                            Subtotal</td>
                         <td width="1" style="background-color:rgb(238,238,238);width:1px"></td>
                         <td width="90" align="right"
                             style="width:120px;font-size:16px;font-weight:400;white-space:nowrap">