If I click on rename for a particular sequence in the Bluemix Editor, it will create a new sequence with the name, but the "old" sequence does still exist.
Thanks very much for the bug report. We have replicated this issue: under certain conditions, the rename fails to delete the old sequence. We'll get this fixed as soon as possible!
In the time being, a workaround is to manually delete the sequence with the old name. There will be no harm in doing so.
Nick Mitchell IBM OpenWhisk Team