Aparece no topo do meu fragmento de diálogo uma linha azul que não consigo me livrar (nem sei por que aparece em primeiro lugar. Alguém sabe como se livrar disso?

Eu testei em vários dispositivos e funciona muito bem em versões posteriores do Android.

Meu código:

    private void setupD,ialog() {
    final Dialog dialog = getDialog();
    final Window window = dialog.getWindow();

    window.setBackgroundDrawable(new ColorDrawable(0));
    window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
    }

layout:

      <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tiktok="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/settings_bg">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true">

        <ImageView
            android:id="@+id/close_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_margin="15dp"
            android:src="@drawable/pressable_close_btn"/>

        <com.cyscorpions.timekeeper.customviews.TKTextView
            android:id="@+id/settings_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="@dimen/dp_40"
            android:text="@string/settings_allcaps"
            android:textColor="@color/timekeeper_blue"
            android:textSize="@dimen/sp_60"
            tiktok:useBoldFont="true"/>

        <com.cyscorpions.timekeeper.customviews.TKTextView
            android:id="@+id/account_name_instruction"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/settings_title"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="@dimen/dp_20"
            android:text="@string/subdomain_instruction"
            android:textColor="@color/gray"
            android:textSize="@dimen/sp_30"/>

        <RelativeLayout
            android:id="@+id/info_field"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/dp_70"
            android:layout_alignLeft="@+id/submit_btn"
            android:layout_below="@id/account_name_instruction"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="@dimen/dp_20">

            <com.cyscorpions.timekeeper.customviews.TKAppCompatEditText
                android:id="@+id/subdomain_textfield"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:background="@drawable/text_field_bg"
                android:hint="@string/textfield_account_hint"
                android:inputType="text"
                android:textColor="@color/gray"
                android:textColorHint="@color/gray"
                android:textSize="@dimen/sp_20"
                tiktok:setTextFieldFont="@string/montserrat_reg"/>

            <com.cyscorpions.timekeeper.customviews.TKTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_toRightOf="@id/subdomain_textfield"
                android:text="@string/domain_suffix"
                android:textColor="@color/gray"
                android:textSize="@dimen/sp_25"/>
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/error_tooltip"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_below="@id/settings_title">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/error_tooltip"
                android:shadowColor="@color/black"/>

            <com.cyscorpions.timekeeper.customviews.TKTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="@dimen/dp_20"
                android:text="@string/field_required"
                android:textColor="@color/white"
                android:textSize="@dimen/sp_30"/>
        </RelativeLayout>

        <com.cyscorpions.timekeeper.customviews.TKButton
            android:id="@id/submit_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/info_field"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="@dimen/dp_10"
            android:background="@drawable/pressable_submit_btn"
            android:text="@string/submit_allcaps"
            android:textColor="@color/white"
            android:textSize="@dimen/sp_30"
            tiktok:hasDarkerPressedState="true"
            tiktok:useDefaultDrawable="true"/>

    </RelativeLayout>

</RelativeLayout>