IMHO the Competency Breakdown Report is not very useful. I just looked at the Moodle Documentation page - and there was no information that described the functionality or behaviors.
I believe, that the Competency Breakdown Report only displays a rating when the setting, Upon Activity Completion = Complete the Competency (automatic with completion of the activity and not manually rated) is used.
I use this plug-in Monitoring of Learning Plans for the excellent visual display -
https://moodle.org/plugins/report_lpmonitointring
Kind Regards
I believe, that the Competency Breakdown Report only displays a rating when the setting, Upon Activity Completion = Complete the Competency (automatic with completion of the activity and not manually rated) is used.
I use this plug-in Monitoring of Learning Plans for the excellent visual display -
https://moodle.org/plugins/report_lpmonitointring
Kind Regards