Tough to replicate with sample data. Please upload a Tableau Packaged Workbook including some dates so we can replicate.
I doubt an upgrade has caused a problem, I'm guessing you're just at a different point in the calendar now and your original calculation isn't working as originally intended.
Hope have done this correctly. It is manufacturing data but same issue.
On the "this year production dashboard" the date parameter is shown and you can see the issue with the "Business Unit Volume" and the "Brand Volume" reports.
Mgt Accounts Production WIP.twbx 145.5 KB