You are registered in the UK, but you are currently on the US ebay.com discussion boards.
Clear your ebay.com cookies, and sign back in to the ebay.co.uk UK site.
If you use your browser's autocomplete to enter addresses, clear your browser history or else you will likely be sent back to the .com site by your browser.
Make sure you are not following any US ebay.com links or using any ebay.com bookmarks.
