Generally when one company's value has an error its because that company is not a real "Company" on WikiRate. In this case, I entered "Deutsche Post AG" in the search box, went to the card, it was a "Basic" card. I opened edit mode, went to the edit drop-down, chose to edit "type", and selected "Company" from the drop-down. That has resolved the issue as described in this ticket (but there could me more of these cases floating around for other metrics).
The "real bug" here is that its still sometimes possible for people to add metric values for companies that aren't represented properly on the platform.
Thanks Richard, that makes sense! We will look out for any more of these and change them to company type.
Since this particular instance is fixed, and we've tried to clean up others, I'm going to go ahead and close this ticket. But I'm definitely interested (a) to hear if we're still seeing these anywhere and (b) to figure out if they're being newly created. It's possible that these are all legacy problems created before we introduced the new interface.