Why when i try run this code in reactjs, its always output wrong total number

Question

i still newbie in reactjs, and i try to build a some project. this project its to display any product price and stock, but here this problem.

i try to sum this number to get a total price in my product in reactjs, but the output always like this. how to fix that...

import React from "react";
import { nanoid } from "nanoid";
import calc from "./calc";

export default class TableData extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
    let arr = []
    const {
      data,
    } = this.props;
    
    const {
      location, proformaItem,
    } = data;

    proformaItem.forEach((item) => {
      const parseStock = JSON.parse(item.product_stock);
      parseStock.forEach((stock) => {
        let total = 0
        if (stock[1] !== undefined) {
          total += Number(stock[1]);
        }
        if (stock[5] !== undefined) {
          total += Number(stock[5])
        }

        arr.push(total);
      })
    })

    console.log(arr);

    return (
      <>
        {
          proformaItem.map((item, index) => {
            const parseStock = JSON.parse(item.product_stock);
            const parseItem = JSON.parse(item.items);

            return (
              <tr key={nanoid(12)}>
                <td key={nanoid(12)}>{parseStock.map((key) => key[1])}</td>
                <td key={nanoid(12)}>{parseStock.map((key) => key[3])}</td>
                <td key={nanoid(12)}>{parseStock.map((key) => key[5])}</td>
                <td key={nanoid(12)}>{item.categoryDescription}</td>
                <td key={nanoid(12)}>{item.productDescription}</td>
                <td key={nanoid(12)}>{
                  parseStock.map((item) => {
                    if (item[1] !== undefined && item[5] !== undefined) {
                      console.log(calc(item[1], item[5]));
                    }
                  })
                }
                </td>
                <td key={nanoid(12)}>1</td>
                <td key={nanoid(12)}>{parseItem.map((key) => key['qty'])}</td>
              </tr>
            )
          })
        }
      </>
    )
  }
}

here's my data in json

{
    "proformaItem": [
        {
            "product_id": "1852",
            "productDescription": "Charcoal Size M",
            "categoryDescription": "7200 Premium Tee",
            "product_stock": "[{\"1\": 272}, {\"3\": 5328}, {\"5\": 177}]",
            "items": "[{\"qty\": 1, \"productId\": 1852, \"proformaInfoId\": 556745, \"proformaItemId\": 2679283}]"
        },
        {
            "product_id": "1801",
            "productDescription": "Black Size S",
            "categoryDescription": "7200 Premium Tee",
            "product_stock": "[{\"1\": 745}, {\"3\": 30744}, {\"5\": 273}]",
            "items": "[{\"qty\": 1, \"productId\": 1801, \"proformaInfoId\": 556745, \"proformaItemId\": 2679284}]"
        },
    ]
}

enter image description here