Originally Posted by Ragnar Draconus
From my understanding on some scattered red posts, they have been doing some tweaks on the amounts of honor it takes to achieve certain ribbons. I can only put forth a guess that maybe the latest patch changed something like this, causing your ribbon to be altered.
That or there is a bug where custom games are counting against your honor to games played ratio, in which case I would encourage a support ticket, even though they can be slow to be resolved.
This originally started months ago for me, with the latest case happening about three weeks back. I am inclined to agree about your second part about it being a bug associated with custom games being taken into account for the ratio of games played, but since Riot keeps the mechanics of honor hidden from players it's so hard to be sure -- this is why I really wanted to contact Riot about it.
Thank you for your post, I think I will put a support ticket in.