You are scheduling Jaspersoft reports on a monthly basis and have started receiving 2 reports for a single schedule instance for the past month.
Component: Clarity Jaspersoft
This can happen if the emails are coming from 2 different servers.
Inspect email headers for duplicate reports to identify if they are coming from 2 different servers. (Example, if those 2 servers mapped to Production and Non Production instances of Jaspersoft, you will want to stop scheduled instance from the non Production environment.)
To identify from which server an email originated from you should do the following: