I've seen this on a couple of different versions of IS. I'm not sure what causes it, when, how or why. And it even happens when a scorecard is built correctly with all bindings. I think there was a fix between 4.2 SP5 and SP5 patch 3 as I have not seen this issue since we did this patch.
You can try to export the KDD and delete and re-import (although you will lose any score history) and hope that works. Otherwise try deleting single rules/ bindings and re-add.
Other than that, upgrade and test again and if still broken, raise an incident.
regards
Adrian