We won a game and then were told by the match end screen we had lost

We took baron, killed four of them, and pushed down their nexus. We didn't lose to a bd or something, since they were all either dead or in base. We destroyed their nexus and then, lo and behold, we get to match end screen and are told we have lost and that the other team won. Since (for me) it didn't tell me what the LP change was, and match history/profile is currently anavailable (ie I can't just check my LP), I can't even find out if it was a bug with the game summary or a bug in reporting win/loss.

Although I have no way of confirming if they were telling the truth, the other members of the game confirmed what happened to me; ie the other team reported a win and my teammates reported a loss.

If I still gained LP I don't care nearly as much, but this game was started around 9:00 - 9:15 am Eastern Time, April 6th, for reference, and I sincerely hope that I did not lose LP for winning a game.

PS Although I still cannot view LP, I have been able to view match history and it is recorded as a win, so it was probably just a bug with the game summary related to the match history work going on right now.