Last month period includes dates from current month
As you can see on screenshots there is Last Month (Jan 2018) period selected, however output includes dates from current month (Feb 2018).
#1 Updated by Kevin Kelly 9 months ago
I encountered this issue today and it was due to a timezone mismatch between the records in the database and the date on the server after migrating Redmine to a new machine. Changing the timezone on the server to match the timezone on the server where the records were originally created resolved the issue.