I just upgraded to Windows 10 from Windows 7 Home

There is a problem, when I open two or more excel .xlsx files and move them to secondary monitor, the excel taskbar button will not appear on the taskbar of the secondary monitor. The excel taskbar button will only appear on the primary monitor.

If I only open one excel file, I can move the excel file to the secondary monitor and the excel taskbar button will appear on the taskbar of the secondary monitor.

All other programs are work fine, the taskbar button will appear on the taskbar where the program window is displayed. Only Excel 2007 and a program called Password Agent has the problem, the program taskbar button will always appear only on the primary monitor, even if I drag the program to secondary monitor.

I am using Excel 2007, please help if there is any solution to make Excel taskbar button appear on the taskbar of the monitor that the opened Excel window is.

This is a screenshot of my taskbar properties:
Click image for larger version. 

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Thanks