A directory showing up in itself

I do cd ~ and then pwd. It shows /root. Then I do ls. It again shows root. This is NOT another directory with the same name because when I do cd root, it says -bash: cd: root: Not a directory. Somehow, I have messed up something. **UPDATE:** The output of ls -l ~/root is:

-rw-r--r-- 1 root root 215040 Oct 15 10:01 /root/root

The output of ls -ld /root/root is:

-rw-r--r-- 1 root root 215040 Oct 15 10:01 /root/root

The output of file /root/root is:

/root/root: POSIX tar archive (GNU)