Adding Employees to Audit list during Auditing

Summary

Added employee to audit list, but all ER not going to audit

Content

Hello:

We are testing implementation of the Expense module and have a question regarding adding an individual to the audit list while the audit is being reviewed.  In test, I checked the box to add the employee to the audit list and used the reason as "violates undefined policy", then went and added 3 expenses that didn't have any policy violations.  Two of the expenses went to audit as "random selection" and the other didn't go to audit.  What am I missing that these are not going to audit?   When I go back to audit another expense for that employee, the