When Microsoft changed into Windows7, something deep down changed how printing was handled. Unfortunately this meant that Magic Contest no longer could print multiple copies properly. Instead, when asked for 3 copies, 9 were printed, when asked for 4 copies, 16 were printed, and so on.
To solve this problem, a setting was introduced that can be reached through Print and Report menu:
Handle Windows7/8/10 print problem (too many copies)
Initially (March 2010) this setting was by default turned off since not all people used Windows7, but as of version 4.11 (February 2017) this setting is turned on by default.
This setting also applies to later versions of Windows such as 8 and 10.