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When copy and pasting text thats bold I've had a similar problem, it keeps wanting to write in bold, also when quoting someone, you press reply that quotes on a message, say you dont want to quote their whole message so you delete a paragraph out by highlighting and deleting, you start writing and it re-appears. Dont ask me to repeat it though as only happens when it feels like it from what I've seen. That was in the  WYSIWYG so maybe its related...