From a 01/01/13 pull of Transunion via myFico:
Under "What's helping your FICO score"
1) There is no evidence of a serious delinquency (60 days past due or greater) or derogatory description on your credit report.
Followed by in the box:
- Number of your accounts that were ever 60 days late or worse: 1 account
The late payment is legit, so it's likely something in your report generation code that's gone a little wonky; or it's being looked at by age and mine is >2 years ago. In either event more clarity or consistency would be a good thing I suspect.