Is this your blog?
polandsoccerblog.blogspot.com
Is this your blog?
If so, then it seems that your blog somehow "re-published" itself on the initial subdomain on which you started the blog.
In this case, you would have to go through a similar process as when you purchased the domain and moved the blog to that domain. I am not too familiar with blogspot as I mainly use Wordpress, but this article might help you.
blogging.nitecruzr.net/2013/01/blogger-magic-republishing-custom.html