Weird Death message plus disconnecting problem

[Zico-Man]

my friends and I have a minecraft server we play on, and we have an issue is where if anyone dies everybody just disconnects and for whoever who doesn't disconnect a weird message replacing the death message with "" here is a video to demonstrate it.

https://www.youtube.com/watch?v=DbszvqWMwKg

I had another person on the server we both disconnected sorry if I didn't show it in the recording.