[GAMEPLAY] Eye of the Oasis Quest Bug

Game in question: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2610972538/220515279?tab=overview

When I (Janna) upgraded my Nomad's Medallion to Eye of the Oasis, my coin stacks reset to 0/650 and no matter how many coins I continued to pick up, the count remained 0/650.

One interesting thing to note is I had purchased Eye of the Oasis earlier in the game and undid the purchase to rush Ardent for my Kog. I wonder if that had something to do with it.

Thanks.

EDIT: Purchasing Ardent seems to be the trigger. In this game, Eye was fine until I bought Ardent then I lost my (previously completed) quest: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2611011115/220515279?tab=overview