When running the following reports from Notes Migrator for SharePoint Console:
Version 6.x:
- User Activity By Database
- User Activity By Database (All Users)
Version 5.x:
- User Activity By Database
The total value of the database usage display 1400 users maximum.
This is limitation of the Lotus Domino itself. Refer to IBM KB article - User activity and database usage statistics display 1400 users maximum:
https://www-304.ibm.com/support/docview.wss?uid=swg21086245
