The Audit Document provides suite-level functionality - and, as such, all tests that execute without a per-testcase error will show as passed in the manage testcase panel, since they executed without issue. The testsuite as a whole is shown as failed although the individual test cases have all passed.
The reason why this testsuite failed is not shown in the portal. This is confusing. It is actually an event audit that has fired, there should not a step started in a testcase containing a certain text , see below (the audit doc):
Perhaps something could be added to the testsuite information popup pointing out there are event audits fired causing the tessuite to fail.