Custom Button style is appearing in preview but not on device API 27

Question

I created a custom button, it is appearing in the preview, but not on my phone. The minimum API is 17 and my phone's API is 27.

//custom button
<style name="taskButton"  parent="Widget.AppCompat.Button">
    <item name="android:layout_alignParentStart">true</item>
    <item name="android:drawablePadding">-3dp</item>
    <item name="android:background">@color/Red</item>
    <item name="android:textAlignment">viewStart</item>
</style>

//xml 
 <Button
                android:id="@+id/homeButton"
                style="@style/taskButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center|start"
                android:drawableStart="@drawable/ic_home_black_24dp"
                android:text="Home"
                android:textAllCaps="false"
                android:visibility="visible" />

Answer 1

I think I found out the problem. I had 2 xml files, one for api 21+ and another one for api 21-. I deleted both, and recreated a new one for all the versions. And my issue is fixed.