UE5.4 5.5 nDisplay rendering error

I am using nDisplay and a shipping package game, previously everything is good, but now all the camera rendering are black or wrong. All the UI could be loaded correctly, but nDisplay doesn’t render camera view. I have tried using localhost IP and fixed IP. Also follow camera view is true. There are not many nDisplay discussions on EPIC UE, but I really need your help. Thank you so much.