Actionbar layout doesn't look right

[trickydude]

I've gone through the steps to set up the tabs, however, my actionbar comes out looking like this:

Why is there an additional actionbar above the tabs? How do I fix this?

Here's my activity_main.xml layout:

<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">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/primary"
        android:minHeight="56dp"
        app:theme="@style/ThemeOverlay.AppCompat.Dark"/>

    <com.astuetz.PagerSlidingTabStrip
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:layout_below="@+id/toolbar"
        android:background="@color/primary"
        android:textColorPrimary="@color/white"
        app:pstsDividerColor="@color/primary"
        app:pstsIndicatorColor="@color/white"
        app:pstsIndicatorHeight="2dp"
        app:pstsShouldExpand="true"
        app:pstsUnderlineHeight="0dp"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/tabs"/>

</RelativeLayout>

My menu_main.xml layout:

<menu 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" tools:context=".MainActivity">
    <item android:id="@+id/action_settings" android:title="@string/action_settings"
        android:orderInCategory="100" app:showAsAction="never" />
</menu>

How do I fix this?

[jpardogo]

That´s because you are using the theme with the toolbar and adding another toolbar in the xml