Yes, my Thirtybees 1.5 shop is always to date.
The Dashboard Activity module is v6.0.2.
I suspect this is caused with something in the database, maybe a table not configured correctly. My Thirtybees shop was a new install, not from a migration from Prestashop, however, I imported some tables from my previous Prestashop database (for customers/sales/inventory...) and renamed the tables for thirtybees and used the Database schema repair from the Core Updater tool.
On my Backoffice Dashboard page, the traffic source shown is always showing maximum of 3 visits.
However, the Stats shown under "Visitors origin" and "Visits and Visitors" from the Backoffice Stats page are recording visits properly for all periods.
I also noticed that on the Backoffice Dashboard page, there is nothing showing when I click on Year, just a white square like below.
Day, Month, Day-1, Month-1 and Year-1 are working like it should.