I created a new site in a spare domain that I have (www.annedorrian.org.uk) and then then did a migration to its new home at http://www.brauncewellquarries.co.uk.
The issue that I have is that when I try to login to the admin panel on the new site (www.brauncewellquarries.co.uk/wp-admin) I now get a redirect back to the admin page of the test site:
https://annedorrian.org.uk/wp-login.php?redirect_to=http%3A%2F%2Fwww.brauncewellquarries.co.uk%2Fwp-admin%2F&reauth=1
with changes being made there. Backups to Google drive also go there.
Noramlly I build test sites using XXAMP and have never had any issues going migrations.
Any pointers in the right direction would be appreciated.