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The default Emote/talk tends to go off when you're fighting.
The default Right-Click+Middle-Mouse (to use emotions) tends to go off when you're fighting. If you set them both to "t" in the settings, this wont happen.
Hope that helps some people.
Customer support service by UserEcho
Pressing the mouse wheel (middle button) happens this sometimes happens when you roll the mouse wheel and ends up rolling with a lot of force.
But I'm in favor of removing the emotes action on the mouse wheel and leaving the action of adding speeches just on the T key.
This is not a bug.