Duplicates in cve collection?

[cgkwork]

I am puzzled as to occurrence of duplicates in the cve collection. This is on the demo at http://bron.alfa.csail.mit.edu/. For example, the following query returns five elements:

FOR c in cve
FILTER c.original_id == "CVE-2015-9251"
RETURN c

The only difference in the five elements returned are the _key, _id and _rev. However, these do not appear to be meaningful differences to me. Despite searching this repository, I am not able to find an explanation. Any ideas?

[hembergerik]

Yes, it could come from when the database is updated (every 24h). We are trying to find a fix for it.
A temporary method for avoiding it is to rebuild the database every time it is updated, e.g. if you set up your own following the docker instructions.