Multiple invoice line in excel report in ODOO 13 - odoo

Question

I am creating this excel report for vat summary for every invoice lines
In an invoice there can be more than one invoice line/journal item
for the same I used the below code
if len(invoice.invoice_line_ids) > 1:
worksheet.write(row, 3, invoice.invoice_line_ids[0].product_id.name)
for product_id in invoice.invoice_line_ids[1:]:
row += 1
worksheet.write(row, 3, product_id.name)
else:
worksheet.write(row, 3, invoice.invoice_line_ids[0].product_id.name)
for a product name its coming correctly
but when I copy the same code for other fields such as VAT name, price subtotal etc its showing as in the image
report sample image
Please check out my full code
#code for Product name which is correct
if len(invoice.invoice_line_ids) > 1:
worksheet.write(row, 3, invoice.invoice_line_ids[0].product_id.name)
for product_id in invoice.invoice_line_ids[1:]:
row += 1
worksheet.write(row, 3, product_id.name)
else:
worksheet.write(row, 3, invoice.invoice_line_ids[0].product_id.name)
#code for vat name which is not correct
if len(invoice.invoice_line_ids) > 1:
worksheet.write(row, 4, invoice.invoice_line_ids[0].tax_ids.name)
for tax_ids in invoice.invoice_line_ids[1:]:
row += 1
worksheet.write(row, 4, tax_ids.name)
else:
worksheet.write(row, 4, invoice.invoice_line_ids.tax_ids.name)
#code for subtotal which is not correct
if len(invoice.invoice_line_ids) > 1:
worksheet.write(row, 5, str(invoice.invoice_line_ids[0].price_subtotal))
for price_subtotal in invoice.invoice_line_ids[1:]:
row += 1
worksheet.write(row, 5, str(price_subtotal))
else:
worksheet.write(row, 5, str(invoice.invoice_line_ids.price_subtotal))