I beg to differ, it makes even more sense.
Preamble: I don't know the figures behind the tag colours.
Imagine you had 100 faultless MP games in the completion record. Then, after that desastrous update, no more luck, Enough disconnects within 40 games to turn your tag yellow. Now there are 60 good games at the far end which have to be pushed out before you get a chance to tackle the bad rounds. 60 games with no chance of improvement.
And, given the poor state of MP stability, some more bad ones might happen pushing you further into "yellow".