Right eye camera flicker on Stereoscopic Rendering

I'm doing Stereoscopic Rendering On Windows, When I set the camera target eye for both everything is OK, but I need to control the left and right eye individually, so i create two cameras one target for left and another for right . Problems comming when you execute the program you will find the screen flicker continuously(not always sometimes), actually the right eye, with the glass you can close your right eye everything is OK, but when you close you left eye with right eye open you will find the screen flicker. use opengl or dx11 rendering is the same.

when i use one camera and use the Camera.SetStereoViewMatrix or Camera.SetStereoProjectionMatrix to set cameras camera came with the same result.