This is caused by the extra enter added to the text box, which only seems to occur on windows.

@RockyTV, this is one of those things I don't get on linux either...
It's most likely related to this:
https://github.com/godarklight/DarkMultiPlayer/blob/master/Client/ChatWorker.cs#L440

And this:
https://github.com/godarklight/DarkMultiPlayer/blob/master/Client/ChatWorker.cs#L548-L560

We'll have to find out if there's any other events we should pay attention to (Like if it's KeyUp or something silly)