Purge Concurrent Request and/or Manager Data

I've recently started having a user complain that their concurrent request history goes back less than a month.  Of course I answered that can't be happening.  After all I am running the Purge Concurrent Request and/or Manager Data concurrent program with Entity=ALL, Mode=Age, and Mode Value=180.  That means concurrent request information would remain in the tables until they were 180 days old or older.

However, when I run this query, I find my oldest concurrent request is about 18 days old.  SELECT MIN(actual_start_date) FROM fnd_conc_req_summary_v

This leads me to two questions.

1)  How can I figure out what's running that is purging concurrent request history?