App don't work correctly on another Computer - windows

I've two PC with dual monitors, with the same configuration (USB to VGA converter, same USB port, same VGA port on the second monitor), same drivers, same version, same Windows (Seven Professional), sames monitors with sames resolution, same on everything I know how to access to.
I've an app on which when I click on a button --> display another maximized window.
On the first PC, the app work correctly, the other maximized window display in full screen on the second monitor.
On the second PC, the app doesn't work correctly ! ):
When I click on the button the other maximized window just open (maximized) on the first monitor, the principal where the app is displayed (as same as the first PC).
So I've tried to
change the screen order (put 1 on left of 2 or 2 on left of 1)
check if the drivers have a problems, but no (no warning or interrogation sign in the "Uninstall a program" program
change size resolution on both screens but nothing
un-maximize the second window's app and close it on the correct screen, nothing, the window just maximize and display on the bad screen like before
Sooooooo I've no idea of where the problem could came...
Sorry if my English is bad and thanks in advance for your answers you're my last resort.
Have a nice day

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What determines which screen the account control popup will appear on?

I'm running a Windows 10 system with one touch screen, one normal screen and no mouse or keyboard. I need to run an application with administrator privileges.
I'm worried about which screen the Account Control popup will appear on - if it appears on the non-touch screen then users will have no way to allow the program to run.
I know that:
It runs on screen 2 on my development PC (with mouse and keyboard, no touch screen), regardless of whether screen 2 is on the left or right
It runs on the same screen regardless of whether the application was launched by a shortcut on the left or right screen.
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[Edit for new things I have tried]
Unplugging screen 2, running the application, closing the application, plug screen 2 back in.
Dragging the UAC popup to screen 1, clicking details, changing UAC settings and returning them to the original state.
[SOLVED]
I figured it out (at least partially) but I can't mark it as answered for at least two days.
Basically, after unplugging and replugging screens the other way around, changing the primary display worked. This didn't work until after I did the plug/unplug, but there's no guarantee that was the thing that did it, since I'd tried a few other things.
So after physically unplugging and replugging monitors so that screen one became screen 2 and the reverse, switching which screen was the primary display works to control the popup now.
Changing the primary display didn't work before. But it does now. I have no idea why - there's no guarantee that it was to do with switching them around.
I would suspect it to pop up by default on the primary display, but remember its last position. This would appear to be confirmed by TechNet: UAC Prompt displays on 2nd monitor only RRS feed:
escknx:
Regardless of what I try, UAC prompts display only on 2nd monitor, while everything else works fine on primary monitor.
Stereoman:
drag the UAC Prompt to your Primary Monitor and click show more details on the prompt then click change when these notifications appear, another UAC window will open up with a vertical bar with 4 different settings, just drag the bar setting down and then back up to it's original setting position then click ok, this will re trigger UAC's screen position to your primary monitor.
So: upon deployment, make sure the touch screen is your primary display, and position the UAC popup there if it isn't.

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