Auto-Archiving reprocess old weeks/months/years reports that are already processed

I would like to activate the Auto-Archiving job. I launched the job manually and the second day, i relauched the job to see what he was doing. I check the log for the auto-archiving job and see that he his processing data that is already processed.

Site #2
This is the biggest site with 9000 visits per month. The auto-archiving have been done yesterday. and today, instead of just compiling just 1 or 2 days, i try to compile the last 52 days, 3 weeks, 3 months and 3 years. Why is that?

INFO [2016-12-11 21:51:06] ---------------------------
INFO [2016-12-11 21:51:06] INIT
INFO [2016-12-11 21:51:06] Running Piwik 2.17.1 as Super User
INFO [2016-12-11 21:51:06] ---------------------------
INFO [2016-12-11 21:51:06] NOTES
INFO [2016-12-11 21:51:06] - If you execute this script at least once per hour (or more often) in a crontab, you may disable 'Browser trigger archiving' in Piwik UI > Settings > General Settings.
INFO [2016-12-11 21:51:06]   See the doc at: http://piwik.org/docs/setup-auto-archiving/
INFO [2016-12-11 21:51:06] - Reports for today will be processed at most every 10 seconds. You can change this value in Piwik UI > Settings > General Settings.
INFO [2016-12-11 21:51:06] - Reports for the current week/month/year will be refreshed at most every 3600 seconds.
INFO [2016-12-11 21:51:07] - Archiving was last executed without error 1 days 6 hours ago
INFO [2016-12-11 21:51:07] - Will invalidate archived reports for 2016-12-10 for following websites ids: 2
INFO [2016-12-11 21:51:09] - Will process 6 other websites because the last time they were archived was on a different day (in the website's timezone) , IDs: 2, 4, 5, 6, 7, 11
INFO [2016-12-11 21:51:09] - Will process 1 other websites because some old data reports have been invalidated (eg. using the Log Import script) , IDs: 2
INFO [2016-12-11 21:51:09] ---------------------------
INFO [2016-12-11 21:51:09] START
INFO [2016-12-11 21:51:09] Starting Piwik reports archiving...
INFO [2016-12-11 21:51:09] Day has finished for website id 2 since last run
INFO [2016-12-11 21:51:09] Will pre-process for website id = 2, period = day, date = last52
INFO [2016-12-11 21:51:09] - pre-processing all visits
INFO [2016-12-11 21:51:34] Archived website id = 2, period = day, 0 segments, 15182 visits in last 52 days, 14 visits today, Time elapsed: 24.204s
INFO [2016-12-11 21:51:34] Will pre-process for website id = 2, period = week, date = last3
INFO [2016-12-11 21:51:34] - pre-processing all visits
INFO [2016-12-11 21:51:50] Archived website id = 2, period = week, 0 segments, 6182 visits in last 3 weeks, 2109 visits this week, Time elapsed: 16.687s
INFO [2016-12-11 21:51:50] Will pre-process for website id = 2, period = month, date = last3
INFO [2016-12-11 21:51:50] - pre-processing all visits
INFO [2016-12-11 21:52:28] Archived website id = 2, period = month, 0 segments, 21035 visits in last 3 months, 2919 visits this month, Time elapsed: 37.484s
INFO [2016-12-11 21:52:28] Will pre-process for website id = 2, period = year, date = last3
INFO [2016-12-11 21:52:28] - pre-processing all visits
INFO [2016-12-11 21:53:37] Archived website id = 2, period = year, 0 segments, 389948 visits in last 3 years, 104723 visits this year, Time elapsed: 69.155s
INFO [2016-12-11 21:53:37] Archived website id = 2, 4 API requests, Time elapsed: 147.784s [1/6 done]