The role you're actually performing is larger than the one written down. Somewhere in your week sits the remembering of other people's appointments, the smoothing of a mood, the thing that would fall over if you stopped and which appears on no list anywhere.
Adults get graded on the documented half. No wonder the internal verdict comes out low. You are being assessed against a description that omits most of the work.
Try the fuller version for a moment. Everything handled this week, including the parts nobody assigned you. Against that, great is not a stretch.