Oracles Bug?

Just wanted to say that I was playing a game on an alternate account. It was an ARAM game, I was Jayce, the enemy had a Teemo and Rengar. Well over 5 minutes after I last bought Oracles the buff ran out and disappeared. However I could still reveal Teemo shrooms and an ulting Rengar just by being near them.

I don't know what caused this but I will link what info I can in the hopes that it helps.

The game was an ARAM game that ended at 10:00 AM (PT) It was played under the account name "Mastery5League"

I already had an Oracles running that I bough during death then activated after I re-spawned. Then during my next death I bought another Oracles to refresh the duration. I never bought another Oracles during that game.

Here is a link to the match history.