Starting in January 2021, Facebook made some changes to the attribution settings. For this reason, you will be able to see changes in the way the results are delivered, both in the Facebook Business manager and in your Bunker DB dashboard.
Regarding the conversion metric totals:
Across all ad sets, conversion metric totals will only be shown at the campaign and account levels where there is a single common attribution setting being used. Where multiple attribution settings are used, conversion metric totals are not shown. You can use the new Attribution Setting column to see which settings are being used.
Check out the Facebook Help Center to learn more about these changes.