I don't know what you did (I don't know what I did when this happened to me), but you ended up with a completely borked Riak cluster. Possible causes and symptoms include:
riak-admin transfers
shows different things depending on the node you run it on- you tried to leave/join nodes to fix things, but it made them only worse
- you ran mixed versions in parallel, instead of doing a clean rolling upgrade
- some data seems to be missing, and when you list the keys in a bucket, clearly there is not the amount you were expecting
- YOU'RE AFRAID YOU MIGHT HAVE LOST DATA