Secure Score - telemetry failing?

In the tenant of one of my customers I noticed a difference in the Secure Scores presented in the Dashboard and on the Score analyzer pages. Even in the Score Analyzer page there were obvious differences.

For example the Data score for a certain date states: 19/218 points achieved (for 3 actions). But when I filter on the completed actions I only see the 3 completed actions are awarded a total of 14 points (no points are awarded for incomplete Data actions).

Any ideas where these differences come from?