2 touch screens - input at the same time not working

I have an application that runs in 2 displays (touch screens).
I have a Canvas and a Camera for each display.

For each display I can have multiple inputs at the same time. For example I can drag 2 images of display 1 at the same time.

I cannot have input from both displays at the same time. For example when I drag something on display 1 I cannot do anything on display 2.

Any ideas?

Thank you in advance!

@grannita Are you using the new input system or the old?