How many feedback has this new account got?
If 0 then by logging in via Goggle then you have opened a new account.
If this is the case then to save a lot of work, if you want to relist on your original account, go to your account, then search for new account, and use list similar for each item.
This may be hard work, so if listed ok, you might just as well let them continue on the new account.
You do not appear to have sold for some time, have you registered either account to sell, with money when withdrawn going to a verified bank account.
https://www.ebay.co.uk/help/selling/getting-paid/registering-seller?id=4792&st=3&pos=2&query=Registe...