bottom 네비게이션

왜 이런가요?ㅠㅠ

bottom_navigation_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/action_home"
        android:icon="@drawable/ic_home"
        android:enabled="true"
        android:title="@string/home"/>
    <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_search"
        android:enabled="true"
        android:title="@string/home"/>
    <item
        android:id="@+id/action_add_photo"
        android:icon="@drawable/ic_add_a_photo"
        android:enabled="true"
        android:title="@string/home"/>
    <item
        android:id="@+id/action_favorite_alarm"
        android:icon="@drawable/ic_favorite_border"
        android:enabled="true"
        android:title="@string/home"/>
    <item
        android:id="@+id/action_account"
        android:icon="@drawable/ic_account"
        android:enabled="true"
        android:title="@string/home"/>

</menu>

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/my_toolbar"
        android:layout_width="match_parent"
        android:layout_height="35dp">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:src="@drawable/logo_title" />
        </RelativeLayout>

    </androidx.appcompat.widget.Toolbar>
    <LinearLayout
        android:id="@+id/toolbar_division"
        android:background="@color/colorDivision"
        android:orientation="horizontal"
        android:layout_below="@+id/my_toolbar"
        android:layout_width="match_parent"
        android:layout_height="1dp"></LinearLayout>
    <FrameLayout
        android:id="@+id/main_content"
        android:layout_below="@+id/toolbar_division"
        android:layout_above="@id/nav_division"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></FrameLayout>
    <LinearLayout
        android:id="@+id/nav_division"
        android:background="@color/colorDivision"
        android:orientation="horizontal"
        android:layout_above="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="1dp"></LinearLayout>
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:menu="@menu/bottom_navigation_main">
    </com.google.android.material.bottomnavigation.BottomNavigationView>

</RelativeLayout>