By REST API of DSS, I've got ric change history of CHUBA.OQ and CHUBK.OQ.
Both have somewhat strange histories, which is very short.
For CHUBA.OQ, if you see the 3rd part of History section, CHIAV.OQ had been lasted only for 3 min 45 sec(2016/07/25T01:24:08.000Z - 2016-07-25T01:27:53.000Z)
Similarly for CHUBK.OQ, CHIKV.OQ lasted for 3min 27sec(2016/07/25T01:28:20.000Z - 2016/07/25T01:31:47.000Z)
Why this kind of duplication is happend?