Sorry for the double post bump but I found the issue in which you are running into with the stereo screens desyncing from each other. Under your “Project Settings > Engine > Input > Mobile” section clear the default touch interface so that it shows “None”. After starting a fresh project I run into the issues we have mentioned with the text not showing up in one eye and when I cleared the touch screen (the virtual joysticks they render on mobile devices) it cleared the issue up for me. Hope it helps.