Why is this?

According to Morningstar, based on June data:

"the delinquent unpaid balance for commercial mortgage-backed securities, or CMBS, continued its decline to a trailing 12-month low of $32.48 billion (4.32%)"

CS and Barclays both say it's over 8%.

None of the above report non-paying B-notes as delinquent but that's maybe 0.5%

4% versus 8%.  What am I missing?