Significant increase of metrics after upgrade to 3.9.1



I have a multi server deployment of Matomo with version 3.5.0 and QueuedTracking with Redis.
After an upgrade to 3.9.1version of Matomo and 3.3.5 of QueuedTracking i found that numbers for many sites are now multiplied by at least 3 to 5 times.
For a sample site :
Visits : 5,12 times
Unique visitors : 3,5 times

I had a look to different version changelogs but i can’t find a meaningful reason for such a gap.
Reports are generated using the core:archive command with a cron every 30 minutes.