I am using Odoo 12 and I would like to make a report for printing the Inventory Valuation at specific date. When I look at the list the quantities are correct and the value also, but when I try to make it work in a report it shows something else, it doesn't take the same value.

   <report id="report_inventory_valuation"
      model="product.product"
      string="Inventory Valuation Report"
      name="mymodule.inventory_valuation_report"
      file="mymodule.inventory_valuation"
      report_type="qweb-pdf" />

    <template id="inventory_valuation_report">
      <t t-call="web.html_container">
        <t t-call="web.external_layout">
          <div class="page">
            <h2>Inventory Valuation Report</h2>
            <div class="row mt32 mb32">
              <div class="col-3">
                <!--<t t-esc="datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')"/>-->
              </div>
            </div>

            <table class="table table-sm">
              <thead>
                <th>#</th>
                <th>SKU</th>
                <th>Name</th>
                <th>Quantity</th>
                <th>Price</th>
              </thead>
              <tbody>
                <t t-set="inventory_cost" t-value="0"/>
                <t t-set="index" t-value="1"/>
                <tr t-foreach="docs.sorted(key=lambda x: x.name)" t-as="product">
                  <t t-if="product.standard_price > 0 and product.qty_at_date > 0">
                    <td t-esc="index"/><t t-set="index" t-value="index + 1"/>
                    <td t-if="product.code">
                      [<span t-esc="product.code"/>]
                    </td>
                    <td t-else="">
                    </td>
                    <td><span t-esc="product.name"/></td>
                    <td><span t-esc="'{0:,.2f}'.format(product.qty_at_date)"/></td>
                    <td><span t-esc="'{0:,.2f}'.format(product.standard_price * product.qty_at_date)"/></td>
                    <t t-set="inventory_cost" t-value="inventory_cost + (product.standard_price * product.qty_at_date)"/>
                  </t>
                </tr>
              </tbody>
             <tfoot>
                <tr>
                  <td>TOTAL</td>
                  <td colspan="3"/>
                  <td t-esc="'{0:,.2f}'.format(inventory_cost)"/>
                </tr>
              </tfoot>
            </table>
          </div>
        </t>
      </t>
    </template>