Hi,
Are you sure the recordings are getting processed?
Have you seen the recording's different files (.webm/.mp4, .pdf, etc) located in /var/bigbluebutton/published/presentation/<meeting_id_of_recording>?
It could be that the system units are not started or that they have to be restarted.
Try issuing journalctl -f -u bbb-rap-resque-worker.service right after finishing a meeting where you recorded. This should give you more information about the processing of said recording, and perhaps more information about your system units and what's going on in your server.
Regards,
J.