Good day @Mark_R , I ran this report and no hidden paychecks came up.  There were two employees who, at the time that these checks were issued, worked here, but have since been terminated.  One was terminated the following October, 4 months after this issue started, and the other left the following year.  

I went through all the terminated employees and found two that had not been checked with
Show in employee lists only

Could the fact this box was not checked be causing this error?