Custom Invoice in Magento 2 showing a empty Page and double Taxes

Question

im trying to make a custom PDF-Invoice for my Magento Store. So i edited the invoice.phtml File and did some Changes. Somehow it worked pretty fine, but there are still two problems and i dont know where i have to do changes to fix this.

When i download a PDF-Invoice there is allways a empty Page and i dont know why! Can you help me?

This is my invoice.phtml

<style>
.pdf_content {
    margin-top: 0mm;
    margin-left: 0mm;
    font-family: Arial, "sans-serif";
    font-size: 12px;
}
.pdf_logo {
    position: absolute;
    width: 36.07mm;
    height: 65.7mm;
    margin-left: 158mm;
    margin-top: 12.5mm;
}
.brief_absender {
    position: absolute;
    padding-top: 45mm;
    padding-left: 23.5mm;
    font-size: 9pt;
}
.adresse_kunde {
    position: absolute;
    margin-top: 55mm;
    margin-left: 23.5mm;
    height: 21.50mm;
    width: 55mm;
    font-size: 12pt;
}
.rechnungsdaten_kunde {
    position: absolute;
    margin-top: 80mm;
    margin-left: 158mm;
    width: 47mm;
    height: 16mm;
    font-size: 9pt;
}
hr {
    width: 100%;
    color: #63b32e;
    border-top: 1px;
}
.footer_data {
    position: absolute;
    width: 210mm;
    height: 16.17mm;
    margin-top: 270mm;
}
p.inhalt {
    position: absolute;
    width: 175mm;
    margin-top: 105mm;
    margin-left: 23.5mm;
    display: block;
}
.green {
    color: #63b32e;
}
</style>

<div class="pdf_content"> <img src="../head_logo_daten.png" class="pdf_logo" />
    <p class="brief_absender"><span class="green">Das ist der Absender</p>
    
    <!-- Rechnungsadresse einblenden -->
    <div class="adresse_kunde">
        <?php if ($this->data["formated_billing_address"]): ?>
        <?php foreach ($this->data["formated_billing_address"] as $bill_detail): ?>
        <?php if ($bill_detail): ?>
        <?php echo __($bill_detail) ?><br/>
        <?php endif; ?>
        <?php endforeach; ?>
        <?php endif; ?>
    </div>
    
    <!-- Rechnungsdetails einblenden -->
    <div class="rechnungsdaten_kunde">
        <hr class="line_green" style="height: 1px;">
        Rechnungs Nr.: <?php echo $this->data['invoiceNo']; ?><br/>
        Bestellung vom: <?php echo $this->data['order_date']; ?><br/>
    </div>
    
    <!-- Rechnungsnummer -->
    <p class="inhalt">
    
    <h4 style="font-size: 14pt">Rechnung: <?php echo $this->data['invoiceNo']; ?></h4>
    
    <table style="width: 175mm; font-size: 12pt;">
        <tr valign="middle">
            <th width="6%" height="30">Anzahl</th>
            <th width="38%" height="30">Produkt</th>
            <th width="38%" height="30">SKU</th>
            <th width="9%" height="30">Stückpreis</th>
            <th width="9%" height="30">Endpreis</th>
            <?php if (isset($this->data['all_Items'][0][1]['label_price'])): ?>
            <th height="30"><?php echo __('Price inc Tax'); ?></th>
            <th height="30"><?php echo __('Total inc Tax'); ?></th>
            <?php endif; ?>
        </tr>
        <?php foreach ($this->data['all_Items'] as $index => $item): ?>
        <?php
        if ( isset( $value[ 'pdf_project_name' ] ) && !empty( $value[ 'pdf_project_name' ] ) ) {
            $pdfProjectName = $value[ 'pdf_project_name' ];
        } else {
            $pdfProjectName = false;
        }
        ?>
        <tr>
            <td><?php echo number_format($item['item_qty'], 0) ?></td>
            <td><?php echo isset($item['color']) ? $item['name'].', '.$item['color'] : $item['item_name'] ?>
                <?php if (isset($pdfProjectName) && $pdfProjectName): ?>
                <?php echo 'Projektname - '.$pdfProjectName ?>
                <?php endif; ?>
                <?php /** todo: fix text out of pdf when print selection inside pdf */ ?>
                <?php if (isset($item['print_selection']) && !empty($item['print_selection'])): ?>
                - <?php echo $item['print_selection']; ?>
                <?php endif; ?>
            </td>
            <td><?php echo $item['item_sku'] ?></td>
            <td><?php echo $item[0]['price_data'] ?></td>
            <td><?php echo $item[0]['price_subtotal'] ?></td>
            <?php if (isset ($item[1]['price_data'])): ?>
            <td><?php echo $item[1]['price_data'] ?></td>
            <td><?php echo $item[1]['price_subtotal'] ?></td>
            <?php endif ?>
        </tr>
        <?php endforeach; ?>
        <tr>
            <?php
            $columns = '5';
            if ( isset( $item[ 1 ][ 'price_data' ] ) || isset( $this->data[ 'all_Items' ][ 0 ][ 1 ][ 'label_price' ] ) ) {
                $columns = '7';
            }
            ?>
            <td colspan="<?php echo $columns; ?>" style="width: 100%;">
                <hr class="line_green" style="height: 1px; width: 100%;">
            </td>
        </tr>
    </table>
    <table>
        <?php foreach ($this->data['bundled_items'] as $key => $value): ?>
        <tr>
            <td><p style="margin:0; line-height:0.5;"><?php echo number_format($value['qty'], 0).' x '.$value['name']; ?></p></td>
        </tr>
        <?php endforeach; ?>
    </table>
    
    <table class="green" style="font-weight: bold; font-size: 12pt;">
        <?php foreach ($this->data['new_totals'] as $key => $value): ?>
        <tr>
            <td style="width:280px;"></td>
            <td style="width:200px; padding-right: 15px;"><?php echo $key ?></td>
            <td style="width:85px; text-align: right;"><?php echo $value ?></td>
        </tr>
        <?php endforeach; ?>
    </table>
    
    <p style="font-size: 10pt;">
        Bezahlart: <?php echo __($this->data['PaymentMethod']); ?>
        <?php if (isset($this->data['order']['shippingMethod'])): ?><br />
        Versand: <?php echo __($this->data['order']['shippingMethod']); ?>
        <?php endif; ?>
    </p>
    
    </p>
    <img src="../footer_daten.png" class="footer_data" /> 
</div>

and why are there two times taxes?

I appreciate every comment or help :)

Greetings