Flutter uygulamamda neden 2 tane BottomAppBar oluşuyor?

class AnaEkran extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: SafeArea(
          child: Scaffold(
              appBar: AppBar(backgroundColor: Colors.white, title: Text("BlockMedia", style: TextStyle(color: Colors.black))),
              body: SingleChildScrollView(
                  child: Column(
                children: <Widget>[
                  //İmages ve Thoughts alanı
                  SafeArea(
                    child: Container(
                      height: 50,
                      width: 610,
                      child: Row(
                        children: <Widget>[
                          Container(
                            width: 175,
                            child: TextButton(child: Text("Resimler"), onPressed: () {}),
                          ),
                          SizedBox(width: 1),
                          Container(
                            width: 174,
                            child: TextButton(
                                child: Text("Düşünceler"),
                                onPressed: () {
                                  Navigator.push(
                                      context,
                                      MaterialPageRoute(
                                        builder: (context) => Thougths(),
                                      ));
                                }),
                          ),
                        ],
                      ),
                    ),
                  ),
                  UserPosts(name: "Nezirhan Şenel"),
                ],
              )))),
    );
  }
}

/// PROFİLE EKRANI ///

class YourProfile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
            backgroundColor: Colors.white,
            leading: IconButton(
                icon: Icon(
                  Icons.arrow_left_outlined,
                  color: Colors.black,
                ),
                onPressed: () {
                  Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) => Home(),
                      ));
                })),
        body: SingleChildScrollView(
          child: Column(
            children: <Widget>[
              Container(
                child: Column(children: <Widget>[
                  Container(
                    child: Row(
                      children: <Widget>[
                        Padding(
                          padding: EdgeInsets.fromLTRB(20, 20, 0, 0),
                          child: Container(
                            width: 100,
                            height: 100,
                            decoration: new BoxDecoration(
                              borderRadius: new BorderRadius.circular(80),
                              color: Colors.grey[350],
                            ),
                            child: IconButton(icon: Icon(Icons.person), onPressed: () {}),
                          ),
                        ),
                        SizedBox(width: 15),
                        Text("", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        Text("", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                      ],
                    ),
                  ),
                  SizedBox(height: 10),
                  Container(
                    child: Row(
                      children: <Widget>[
                        SizedBox(width: 15),
                        Text("Takipçiler", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        SizedBox(width: 30),
                        Text("Takip Edilenler", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        SizedBox(width: 30),
                        Text("Paylaşımlar", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        SizedBox(width: 15),
                      ],
                    ),
                  ),
                  Container(
                    child: Row(
                      children: <Widget>[
                        SizedBox(width: 35),
                        Text("75", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        SizedBox(width: 105),
                        Text("75", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                        SizedBox(width: 105),
                        Text("75", style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
                      ],
                    ),
                  ),
                  SizedBox(height: 10),
                  Row(
                    children: [
                     
                      FlatButton(
                        child: Text("Takip Et", style: TextStyle(fontSize: 25, color: Colors.white)),
                        minWidth: 150,
                        height: 60,
                        color: Colors.lightBlue,
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(18.0),
                        ),
                        onPressed: () {},
                      ),
                      FlatButton(
                        child: Text("Mesaj gönder", style: TextStyle(fontSize: 25, color: Colors.black)),
                        minWidth: 100,
                        height: 60,
                        //color: Colors.lightBlue,
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(18.0),
                        ),
                        onPressed: () {
                          Navigator.push(
                              context,
                              MaterialPageRoute(
                                builder: (context) => Mesaj(),
                              ));
                        },
                      ),
                    ],
                  ),
                  SizedBox(height: 10),
                  Container(
                    child: Row(
                      children: <Widget>[
                        Container(
                          child: FlatButton(
                            minWidth: 185,
                            height: 60,
                            child: Icon(Icons.photo),
                            onPressed: () {},
                          ),
                        ),
                        Container(
                          child: FlatButton(
                            minWidth: 185,
                            height: 60,
                            child: Icon(Icons.comment),
                            onPressed: () {},
                          ),
                        ),
                      ],
                    ),
                  ),
                ]),
              )
            ],
          ),
        ),
      ),
    );
  }
}