It's because he received negative trusted from one person and positive trust from another persons. So, it's a bit undefined...
Who is right, who is wrong?
This. The account has an overal positive rating, but due to my rating left as a warning it appears as this organge rating somewhere between red and green. IIRC this was implemented so a single negative rating could be used as a warning on a trusted account regardless of the previous standing.
Since MZ repaid the loan, I removed the rating. Thanks for bringing this up, I had forgotten about it.