You are looking at the Timesheets grid view in the Modern UX (MUX).
There are some resources that used to be open for time but are currently not open for time.
These resources are shown in the grid view with a status of Open even though they are not open for time.
Release : All
Component :PPMTMM
Analyzed by SE and working as designed.
If the user (or any user) clicked on the timesheet while the user was open for time entry, the timesheet gets created in the database.
If this has happened the record will continue to show on the grid even though the resource is now not open for time entry.