Screen share from windows 8 using video call app is not working properly

Dear All I am using the screen share feature of video call app.
I am using firefox 56!
I it working fine if I share screen from windows 7 system.
but WHEN I SHARE from windows 8 it share the screen but it is a FIX screen share. It does not update the screen even though I change the page of the screen being shared. It get updated only if I resize the screen being shared.
I wish there will be some update for this