Just in the last day, I've had words or initials (instead of full board names) typed with more than one capital letter automatically reduced to all lower-case letters after a very long wait. --Moony
Just a short, two word one, yeah - *HUGS MPL!* was it. All of the letters were reduced to lower case. --Moony
Whenever a message is typed in all caps, the board corrects it. You have to add at least one lower case letter in your message to avoid the autocorrect.
Probably the boards "Shouting" setting. It does that for thread titles, it may be applying to the group messages too. Try putting one non capital letter in there somewhere, and see if it still happens.