So I was just in a utility room doing something and then all of a sudden a player name said something on the chat that was not in whisper and was not in the room. Then more people started talking and then I decided to report this 10 minutes later.

And I swear it's not the previous chats from other rooms. Oh and the thing is scrolled up because the stalking ended and other stuff I don't feel like explaining.
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e: my friend said it could be from the usa chat
another edit: just figured out it was but its still a bug right.

It seems that a person has the same problem with you here
As Luxurz said, it's a bug and it will hopefully be fixed soon.