Try these instead @ariesto
<th>Shipping Method</th>
<td>
{%- for line_item in order.line_items -%}
<div>
{{ line_item.fulfillment.tracking_company }}
{%- if line_item.fulfillment.tracking_number -%} #{{ line_item.fulfillment.tracking_number }} {%- endif -%}
</div>
{%- endfor -%}
</td>