Os usuários nesta postagem relataram o mesmo problema, portanto, verifique se você está executando o "Super Utility":
Atalho de teclado para mover uma janela entre dois monitores em vez de arrastar e soltar.
I had a similar issue. A window would jump to a different monitor as I typed unexpectedly. The issue started shortly after I installed a "J5 Create" USB 3.0 VGA adapter, model JUA310. Their software installed "Super Utility". It assigned three hotkeys for the three monitors to move the active window to a different monitor, Ctrl+1, Ctrl+2, and Ctrl+3. I resolved the issue by disabling the hotkeys via the "Super Utility". Here is a procedure.
In the Windows 7 tray, right click on "Super Utility" and select "Multi-Display Control Panel". The "Multi-Display Control Panel" is displayed. Select the "Disable" button. Select the "Save/Exit" button.