Noob ProbertyDrawer question

Hello,
Ive just grabbed an example from the web and playing with it to learn about Property Drawer.
Just wondering if someone could inform me why I get a little side scroll on int arrays when I place it under an existing array. If you look at the image you can see the difference between the two. How can I kill it !!

[CustomPropertyDrawer(typeof(GridData), true)]
public class GridDataPropertyDrawer : PropertyDrawer {


    public override void OnGUI(Rect position,SerializedProperty property,GUIContent label){
        EditorGUI.PrefixLabel(position,label);
        Rect newposition = position;
        newposition.y +=  EditorGUIUtility.singleLineHeight;
        SerializedProperty data = property.FindPropertyRelative("rows");
        //data.rows[0][]
        for(int j=0;j<GridData.numRows;j++){
            SerializedProperty row = data.GetArrayElementAtIndex(j).FindPropertyRelative("colum");
            newposition.height =  EditorGUIUtility.singleLineHeight;
            if(row.arraySize != GridData.numColums)
                row.arraySize = GridData.numColums;
            newposition.width = position.width/GridData.numColums ;
            for(int i=0;i<GridData.numColums;i++){
                EditorGUI.PropertyField(newposition,row.GetArrayElementAtIndex(i),GUIContent.none);
                newposition.x += newposition.width;
            }

            newposition.x = position.x;
            newposition.y +=  EditorGUIUtility.singleLineHeight;
        }
    }

    public override float GetPropertyHeight(SerializedProperty property,GUIContent label){
        return  EditorGUIUtility.singleLineHeight * GridData.numRows +  EditorGUIUtility.singleLineHeight;
    }
}

Try

EditorGUI.indentLevel--;
for(int i=0;i<GridData.numColums;i++){
                EditorGUI.PropertyField(newposition,row.GetArrayElementAtIndex(i),GUIContent.none);
                newposition.x += newposition.width;
}
EditorGUI.indentLevel++