Mouse clicks outside the dropdown menu

Hi,

I have the code below:

 

app.menubuttonHomeButton.Click() # open dropdown menu => ok.

 

app.popup.menuitemExit.Click() # click on Exit item => the problem is, the mouse clicks outside the dropdown menu.

 

This issue occurs on my laptop. No problem when running on a desktop pc.

 

I am running Windows 10.

 

Thanks.