fix recalculating voucher

view/ShoppingCart.js

@@ -364,12 +364,12 @@ class ShoppingCart extends React.Component {
                 } else {
                     if (this.state.kasproPoint - ((parseInt(this.props.order_total) - parseInt(this.props.voucher.reward.value)) + this.props.grabamount) >= -1) {
                         this.setState({
-                            pointsused: this.props.order_total + this.props.grabamount,
+                            pointsused: (parseInt(this.props.order_total) - parseInt(this.props.voucher.reward.value)) + this.props.grabamount,
                             balanceused: 0
                         })
                     } else {
                         this.setState({
-                            balanceused: (this.props.order_total + this.props.grabamount) - this.state.kasproPoint,
+                            balanceused: ((parseInt(this.props.order_total) - parseInt(this.props.voucher.reward.value)) + this.props.grabamount) - this.state.kasproPoint,
                             pointsused: this.state.kasproPoint
                         })
                     }