calling setCompoundDrawablesWithIntrinsicBounds on multiple views with the same background gives inconsistent sizes

Question

I've got a LinearLayout with two EditText descendants (not direct children). I call EditText.setCompoundDrawablesWithIntrinsicBounds(0,0,R.drawable.xyz,0) on each to put a drawable (the same drawable) on the right side of each of the EditTexts. The two edit texts are identical, except for their order in the ListView. However, the size of the drawable in the first EditText becomes larger than the second after adding the drawables. Specifically, the first EditText resizes to accomodate the intrinsic size of the drawable, whereas the second EditText does not (although it does grow some small amount).

Why do two of the same drawables appear differently in the two near-identical views?

Also, I could solve this problem by figuring how to make the drawable not force the EditText to resize. As you can see, I've followed the directions at https://developer.android.com/guide/topics/resources/drawable-resource.html#LayerList regarding making the background scale, but that doesn't seem to do the trick.

the code:

<LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">

    <TextView 
        style="@style/fieldLabel"
        android:text="phone number"/>
    <EditText
        android:id="@+id/contactPhoneField" 
        android:inputType="phone"
        android:layout_width="fill_parent"
        style="@style/editableField"/>

</LinearLayout>

<LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">

    <TextView 
        style="@style/fieldLabel"
        android:text="e-mail address"/>
    <EditText
        android:id="@+id/contactEmailField" 
        android:inputType="textEmailAddress"
        android:layout_width="fill_parent"
        style="@style/editableField"/>

</LinearLayout>

the drawable:

    <?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>

        <shape android:shape="rectangle">

            <gradient 
                android:startColor="#FFD060" 
                android:endColor="#FFBB33"
                android:angle="270"/>
            <padding android:left="5dp" android:top="5dp"
                android:right="5dp" android:bottom="5dp" />
            <corners android:radius="5dp" />
            <stroke android:width="2dp" android:color="#FF8800"/>
        </shape>

    </item>
    <item android:drawable="@drawable/warn"/><!-- a 35x35 px png which is taller than the native height of an EditText-->
</layer-list>

then at some point I call:

contactPhoneField.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.error_background, 0);
contactEmailField.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.error_background, 0);

Additionally, every subsequent time I call EditText.setCompoundDrawablesWithIntrinsicBounds(0,0,R.drawable.xyz,0) (after calling it the first time) causes first EditText's size to toggle between matching the 2nd EditText and matching the drawable size!