I am using the default usage metric report. It shows a few users who have opened the report 100+ number of times for a specific time period. These report opens seem to be for a specific day i.e. 26th march user x opened the report 100+ times.
For report page views it is showing blank. When reaching out to these users, they have actually informed they have not opened the report before!
Why else could there user ID appear showing they have used the report when they have not?