We're having the same issue, Shane. My Team(FEISAR[FEISAR]) played several TT ranked games, on two seperate days, and lost two Ranked games to the abyss, to only have the games show up on our personal record, but not in our Ranked Stats or Team History. One of our team members actually was at a gaming resturant/bar, on their machine, playing one of the "vanishing" games with us, and the same issue occured.
We poked support, to get...basically the cold shoulder, telling us that one of the reasons may be all 10 players(Sounds like generic SR message) leaving at once may cause this issue, so we're going to attempt to disconnect one by one, with 5 second intervals in between, see if that helps stop this bug.
Did you get LP for those games, but not IP? Because we did not get LP, don't know about IP.
Both of these matches do not appear in our Team History.
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2133569346/32701812?tab=overview
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2137486378/32701812?tab=overview
Thanks for posting this, good to know we're not alone with this irritating bug.
-Lee Wolf