Kibana Derive Queries seem to have values cached

[debhelsdon]

When I use derive query to create me a batch of searches. kibana version 3.0.0
EG If i then delete them all apart from the last query box and replace the query string with eg* it will label everything in the graphs with the original derive query label that was there before but update the actual data. I can fix this by adding a new query box with * and deleting the old one. But this seems like a bug to me?