Create New personal chat is a bit odd

We’ve come across a funny bug so whenever I open the chat box towards my friend Simon, but I do NOT type anything. He gets a notification (green circle ball) next to our chat window.

If he checks his messages, he obviously doesn’t see anything because I haven’t typed anything. BUT this makes it so that I get a green circle next to his name. Resulting into an infinite loop of chat notifications without writing any chat messages.

I’ve had it a few times with different people now.