Why does an AJAX request get 2 responses?

Question

React

Good afternoon!
Brief essence of the project: we receive a list of space launches from the server and display it in the OldTable2 table . The launch date can be changed using the RangePicker
For some reason, when using componentDidMount , the response comes 2 times.
You could leave it like that, but if you call any function (for example, you need to show a modal window, if there are no launches for the selected time, then it will work 2 times.
I tried not to call fetchOldLaunches when calling the launchDateButtonOnChange function , but immediately componentDidMount , but the answer is the same comes 2 times.Checked other requests, also 2 answers each.

Here you can see the response from the server, there is data.

If there is no data

Console output on initial page load

Console output if the date is changed and if there is no data

index.js

import React, { Component } from 'react'
import { Layout, Menu, DatePicker } from 'antd'
import OldTable2 from '../LaunchCatalog/component/TableOld2/TableOld2'
import moment from 'moment'

const { Header, Content, Footer } = Layout
const { RangePicker } = DatePicker
let oldurl = 'https://launchlibrary.net/1.4/launch?startdate=' + moment('2020').format('YYYY-MM-DD') + '&enddate=' + moment().format('YYYY-MM-DD') + '&limit=10000&fields=name,net,location,status,rocket,mapURL,countryCode'

class LayoutContainer extends Component {
    constructor(props) {
        super(props)
        this.state = {
            launchOldData: null,
        }
        this.launchDateButtonOnChange = this.launchDateButtonOnChange.bind(this)
    }

    fetchOldLaunches(oldurl) {
        fetch(oldurl)
            .then(response => response.json())
            .then(data => this.setState({ launchOldData: data }))
    }

    componentDidMount() {
        fetch(oldurl)
            .then(response => response.json())
            .then((data) => { this.setState({ launchOldData: data }) })
    }

    launchDateButtonOnChange(date, dateString) {
        oldurl = 'https://launchlibrary.net/1.4/launch?startdate=' + dateString[0] + '&enddate=' + dateString[1] + '&limit=10000&fields=name,net,location,status,rocket,mapURL,countryCode'
        this.fetchOldLaunches(oldurl)
    }
    render() {
        return (
            <Layout id="layout">
                <Header>
                    <Menu theme="dark" mode="horizontal" defaultSelectedKeys={['2']} style={{ textAlign: 'right' }}>
                        <Menu.Item key="1">Статистика</Menu.Item>
                        <Menu.Item key="2">Запуски</Menu.Item>
                    </Menu>
                </Header>

                <Content style={{ padding: '0 50px' }}>
                    <div className="site-layout-content">
                        <RangePicker
                            onChange={this.launchDateButtonOnChange}
                        />

                        <h1 style={{ textAlign: 'center' }}>Состоявшиеся запуски</h1>
                        {this.state.launchOldData
                            ? <OldTable2 launches={this.state.launchOldData.launches} />
                            : <div>Загрузка ... </div>

                        }
                    </div>
                </Content>
                <Footer className="footer">
                    Design © 2020
                        </Footer>
            </Layout>
        )
    }
}

export default LayoutContainer