Getting Wrong Data via WPGRAPHQL Query

My WordPress Menu: https://ibb.co/TTCs2cz

I am getting Child Page twice, once it is shown as a child page and another time it is displayed as a Level one Menu item, It must not show as a Level 1 menu page.

Is it a bug in the plugin or I am doing it the wrong way????
My WPGRAPHQL Query

query mainMenu {
  menu(idType: NAME, id: "main menu") {
    menuItems {
      edges {
        node {
          id
          uri
          title
          target
          label
          childItems {
            edges {
              node {
                id
                uri
                title
                target
                label
                parentId
              }
            }
          }
        }
      }
    }
  }
}

WPGRAPHQL Query RESULT

{
  "data": {
    "menu": {
      "menuItems": {
        "edges": [
          {
            "node": {
              "id": "cG9zdDozNA==",
              "uri": "/",
              "title": "home link",
              "target": null,
              "label": "Home",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDozMA==",
              "uri": "/about-us/",
              "title": null,
              "target": null,
              "label": "About Us",
              "childItems": {
                "edges": [
                  {
                    "node": {
                      "id": "cG9zdDo2MQ==",
                      "uri": "/child-page/",
                      "title": null,
                      "target": null,
                      "label": "Child page",
                      "parentId": "cG9zdDozMA=="
                    }
                  }
                ]
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDo2MQ==",
              "uri": "/child-page/",
              "title": null,
              "target": null,
              "label": "Child page",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyOA==",
              "uri": "/portfolio/",
              "title": null,
              "target": null,
              "label": "Portfolio",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyOQ==",
              "uri": "/services/",
              "title": null,
              "target": null,
              "label": "Services",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyNw==",
              "uri": "/contact-us/",
              "title": null,
              "target": null,
              "label": "Contact Us",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDozNw==",
              "uri": "/policy/",
              "title": null,
              "target": null,
              "label": "Policy",
              "childItems": {
                "edges": []
              }
            }
          }
        ]
      }
    }
  },
  "extensions": {
    "debug": [
      {
        "type": "DEBUG_LOGS_INACTIVE",
        "message": "GraphQL Debug logging is not active. To see debug logs, GRAPHQL_DEBUG must be enabled."
      }
    ]
  }
}

Expected Result

{
  "data": {
    "menu": {
      "menuItems": {
        "edges": [
          {
            "node": {
              "id": "cG9zdDozNA==",
              "uri": "/",
              "title": "home link",
              "target": null,
              "label": "Home",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDozMA==",
              "uri": "/about-us/",
              "title": null,
              "target": null,
              "label": "About Us",
              "childItems": {
                "edges": [
                  {
                    "node": {
                      "id": "cG9zdDo2MQ==",
                      "uri": "/child-page/",
                      "title": null,
                      "target": null,
                      "label": "Child page",
                      "parentId": "cG9zdDozMA=="
                    }
                  }
                ]
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyOA==",
              "uri": "/portfolio/",
              "title": null,
              "target": null,
              "label": "Portfolio",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyOQ==",
              "uri": "/services/",
              "title": null,
              "target": null,
              "label": "Services",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDoyNw==",
              "uri": "/contact-us/",
              "title": null,
              "target": null,
              "label": "Contact Us",
              "childItems": {
                "edges": []
              }
            }
          },
          {
            "node": {
              "id": "cG9zdDozNw==",
              "uri": "/policy/",
              "title": null,
              "target": null,
              "label": "Policy",
              "childItems": {
                "edges": []
              }
            }
          }
        ]
      }
    }
  },
  "extensions": {
    "debug": [
      {
        "type": "DEBUG_LOGS_INACTIVE",
        "message": "GraphQL Debug logging is not active. To see debug logs, GRAPHQL_DEBUG must be enabled."
      }
    ]
  }
}