[CLIENT] Owning A type of quint x6 while purchasing x3

Hello and thanks for reading! I encountered a bug where when I purchased x3 Rank 3 attack speed Quintessence runes I ended with 6 in my inventory. It happened on the 15th of January 2017. I can recall that I purchased the three runes to make my yasuo rune page and when I purchased the quints some pop up appeared, I believe it was an error though I am unsure as I didn't think much of it, Something along the lines of error with purchase please try again later. I noticed that the IP was removed from my account and remarked something to a friend in discord about how it just took my IP. At that point the que popped before I could check my runes to see if they were there and forgot to check after the game but the next time I was on, a few hours after the initial purchase, I logged in and found that I had x6 of the same one! I suspect that the client thought I couldn't get them at the time and I received the quints anyway then was given them again to compensate for the error. I am unable to replicate this as I don't have much IP to use on runes and no pages I am currently looking to make. Though this is mostly a visual error to me at the moment, I fear this could be used to turn a purchase of 1 quint/rune into two to abuse the system :(. I don't believe my connection was a problem as nothing happened in discord with the friend I was talking to. Let me know if I can help any more! Thank you again for reading https://gyazo.com/e383625a1295e18de8b39ba8644551db (Screen shot of purchase in history) https://gyazo.com/6f6c1c9a5fdce05b420abb6ee84a97e4 (x6 Attack speed quints available) https://gyazo.com/c53e076da1e3d3757b308d039631697b (x3 Quints in use and x3 open for use)