I have seen that before

HCL Notes/Domino 8.5 Forum (includes Notes Traveler)

Subject:

In the event where a calendar profile document is in a partial state . This means a profile document is deleted, the database is opened, a partial profile document is created where the owner field (and other as well) are not yet set (the user does not go to preferences. simply opens the database after the profile doc is recreated).
When adminp runs to apply mail policies (every 12 hrs) ,if a mail database is found with a partial profile document, it will end up applying the mail policy settings and saving the profile document . This results in the owner field getting set to the server name.

This can be easily reproduced.

The question here becomes... what deleted the profile document. Was it intentional and the user never went to preferences to save the profile doc so a partial one was created. Or did something come in and deleted the existing one. In my case the issue was caused by the creation of local replicas where the database that had not yet fully replicated was opened creating a duplicate profile. The replication code then is designed to delete the oldest profile document and keep the new one which happened to be a partial one. Adminp would then come in and set the owner field to the server name.

Lotus Software Knowledge Base Document

Title: Calendar Profile Document Is Deleted If Local Replica Is Opened Prior To a Full Replication
Doc #: 1608239
URL: http://www.ibm.com/support/docview.wss?uid=swg21608239

Feedback response number RCAA9KSJSQ created by ~Keiko Deskiburli on 06/05/2014