Este é meubarra de busca:

<SeekBar
    android:id="@+id/seek1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:progressDrawable="@drawable/style_progressbar"
    android:thumb="@drawable/style_progressbar_circle"
    android:progress="20" />

Isto éstyle_progressbar.xml:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape android:shape="rectangle" >
            <corners android:radius="5dp" />
            <gradient
                android:angle="270"
                android:endColor="@color/gris_hint"
                android:startColor="@color/gris_hint" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape android:shape="rectangle" >
                <corners android:radius="5dp" />
                <gradient
                    android:angle="270"
                    android:endColor="@color/gris"
                    android:startColor="@color/gris" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape android:shape="rectangle" >
                <corners android:radius="5dp" />
                <gradient
                    android:angle="270"
                    android:endColor="@color/gris"
                    android:startColor="@color/gris" />
            </shape>
        </clip>
    </item>
</layer-list>

E este é style_progressbar_circle.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/red_scrubber_control_disabled_holo" android:state_enabled="false"/>
    <item android:drawable="@drawable/red_scrubber_control_pressed_holo" android:state_pressed="true"/>
    <item android:drawable="@drawable/red_scrubber_control_focused_holo" android:state_selected="true"/>
    <item android:drawable="@drawable/red_scrubber_control_normal_holo"/>
</selector>    

É assim que eu vejo no Lollipop

É assim que deve ser, é assim no Kitkat e nas versões inferiores.

Qualquer ideia? Eu tenho alguns problemas com layouts no Lollipop, mas este é o único que não consigo resolver sozinho.