Multidisplay with multitouch

Platform Window , unity version 2021.2.1f1c1

The main screen is controlled by the touch screen of windows

The sub screen obtains radar signals through external radar + tuioinput plug-in, realizing the interaction between the sub screen and people

Both the touch operation of the main screen (click, drag, etc.) and the step operation of the sub screen (click, follow, etc.) can operate correctly, but now there is a problem. When touching the main screen, the sub screen will flash with unknown reasons (It seems to affect the lens signal of the sub screen projector, but theoretically, the software should not affect the signal output.Sometimes the windows table of the sub screen can be seen)

At present, it is preliminarily speculated that it is the reason for multi screen and multi touch, but it is difficult to make further progress I want to know why and how to solve it,Thank You! Please let me know if you need more information