Did you remember to include the trailing / in the paths you pushed to the central-registry?
If you did, can you show us the value of asdf:*central-registry* ? Which version of asdf are you using? (asdf:asdf-version)
The version of asdf is 2.019 and my *central-registry* is:
(#P"c:/home/lisp/chunga-1.1.1/" #P"c:/home/lisp/cl-base64-3.3.3/" #P"c:/home/lisp/cl-fad-0.6.3/" #P"c:/home/lisp/cl-ppcre-2.0.3/" #P"c:/home/lisp/cl-who-0.11.1/" #P"c:/home/lisp/drakma-1.2.3/" #P"c:/home/lisp/flexi-streams-1.0.7/" #P"c:/home/lisp/hunchentoot-1.1.1/" #P"c:/home/lisp/lw-add-ons-0.8.9/" #P"c:/home/lisp/lw-doc-0.3.3/" #P"c:/home/lisp/md5-1.8.5/" #P"c:/home/lisp/rfc2388/" #P"c:/home/lisp/trivial-backtrace/")