Odd bug with the Lunar Revel Shop

Yesterday, I logged onto League and saw my Lunar Revel Shop I clicked on all of the skins and they were pretty meh I only bought Blood Moon Thresh.

The skin all the way on the left, I believe, was a Garen skin, and it was not in my taste so I didn't buy it.

I log on today, and it appears as though I didn't view the skin all the way on the left yet, and I clicked on it and it gave me a discount for a different skin.

Not sure if buying it would be some weird exploit or something, but my Lunar Revel shop did not originally give me that skin.. Haven't touched it since.