help 2 monitor

Have 2 monitors, Main one - 1920x1080, other is 1680x1050. I did the setup as: main 1 display other one is set for 2 display. When I start wow1, wow2 and wow3 all 3 are on the main monitor. I have to move 2 and 3 to other monitor. I have did the Wizard 3 times and the setup 3 or 4 times. All the same thing. How can I get the main wow1 on the main monitor and wow2 and wow3 on the other monitor? Thanks for the help.