Spinner background is not correct on Android 6.0+

I use Android project(old project) on Eclipse.

I install ADT from here:

https://dl-ssl.google.com/android/eclipse/

In my manifest.xml

<uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="15" />

snippet of xml layout:

  <Spinner
        android:id="@+id/currencySpinner"
        style="@style/racommon_spinner_custom_style"
        android:layout_width="0dip"
        android:layout_height="40dip"
        android:layout_weight="0.3"
        android:prompt="@string/currency" />

here styles.xml

  <style name="racommon_spinner_custom_style" parent="@android:style/Widget.Holo.Light.Spinner">
    <item name="android:background">@drawable/racommon_spinner_custom_bg</item>
    <item name="android:clickable">true</item>
</style>

Here drawable racommon_spinner_custom_bg:

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/spinner_selected_custom_border"/>

    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/spinner_pressed_custom"/>

    <item android:drawable="@drawable/spinner_default_custom" />
</selector>

here res\drawable-mdpi\spinner_pressed_custom.9.png

Here result on Android 4.3

and here result on Android 6.0+

Here when click on spinner:

As you can see the background of spinner is different than on Android 4.0. On android 4.0. is correct spinner's background. But in android 6.0+ not correct.

Here result nine-pathch generator

Why?