Some Line In The Customer Address

Hello I have got orders from customers where something strange as below happened

A High Howdon is written twice

The question is why or what is wrong

Thanks a lot

David Bare

33 Laing Grove High Howdon

High Howdon

Wallsend, Tyne and Wear NE27 0DE

If the customer was using Auto-fill in their browser, it could have added "High Howdon" to the Address2 field.

Do the customers use Paypal Express as the check out method?