We are currently investigating this incident.
The new pip system should also be temporarily reverted
You should consider also reverting the new Pip system for now until you re-implement the new matchmaking. The old matchmaking's rank constraints paired with the difficulty of obtaining and maintaining red ranks for the average player, lead to red ranks being nearly deserted and people up there cannot play the game any more, and also have no means to lower their ranks without any games.
The new matchmaking pretty much ignored ranks for many lobbies so that wasn't a problem, but it is now.
EDIT: Just making it clear, because people apparently can't read properly. This is just meant as a TEMPORARY solution. I am not requesting a complete and permanent reversal of the new Pip System. Take that discussion elsewhere, please.