In that case, you're probably accidentally hitting the key to the left of the right shift. Try to reproduce this sudden-chat opening behaviour by pressing keys around your main control layout. It's pretty tricky to narrow down the issue for left-handed persons, having different keyboard layout above it, not gonna lie... So my best guess is that you're hitting the key responsible for opening command window (it's the same chat, but it conveniently starts your message with "/" for command input)
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7embre's post in Question about chat box was marked as the answer