eBay order shipping address line two contains the order tracking code. It begins with 'eBay' (e.g ebaymf2ggs).
By default Selro doesn't not remove this tracking code from the shipping address when creating courier labels.
However if you would like to remove it automatically before creating the courier shipping label, please follow the below steps.
Please go to the eBay connection settings and click 'Advance Settings next to the order download.
This will show the below window and please select the 'Remove eBay tracking code from address line (For Shipping Labels)'