Reports are categorized in CU*Spy according to the type of report, not the output queue to which they were printed. If a particular on-demand report also happens to be set up for Monthly Automation via the Report Scheduler, even if it is scheduled to print to the MONTHxx OUTQ it will still go to the same category in CU*Spy as always, not to the End of Month tab.
Hint: When you are checking your automated reports to make sure they all ran, rather than try to remember where they normally get placed in CU*Spy, just use the All Reports tab and a selection date of the 1st of the month (i.e. 12/1/12 to 12/1/12) and look for the list of reports you have automated (use Tool #759 "Report Automation - Standard Reports" as a guide to which ones to check).