Hi,
It is strange, you have a "negative zero" in your invoice.
You can edit the view "checkout | invoice" and edit the lines:
$taxes = $this->order->order_subtotal-$this->order->order_subtotal_no_vat+$this->order->order_shipping_tax-$this->order->order_discount_tax;
if($taxes != 0){
By (if you want to remove the line if "near" zero):
$taxes = (float)($this->order->order_subtotal-$this->order->order_subtotal_no_vat+$this->order->order_shipping_tax-$this->order->order_discount_tax);
if(bccomp($taxes, 0.0, 2) != 0){
Or by (if you want to remove the line completely):
$taxes = $this->order->order_subtotal-$this->order->order_subtotal_no_vat+$this->order->order_shipping_tax-$this->order->order_discount_tax;
if(false){
Regards,