URGENT: Mixed cam bollboard working strange

 
Hi all,I'm using the mixed cam unreal comp but the billboard on tracked camera input 5 and 6 seem to work the opposite way.On input 1 I can mask perfectly the billboardshttps://imgur.com/tlelY1D
but on the other 2 inputs the mask seems to be at the center of the billboard expanding outwards.https://imgur.com/WAEaPFZ
any tips?
I have an event coming up the day after tomorrow and i cant find the solution.
thanks
Riccardo?

   Ict Tech