Lunal revel shop bug

Hello, one of my offers just changue, and I don't know why.

Here is the proof

I used to have the highnoon Yasuo offer in here, (http://i.imgur.com/FC5ip2g.png)

And then after like an hour it changues to Arclight vayne with vayne (http://i.imgur.com/vKyyBG6.png)

It doesn't butter me, but is this a bug? Or my Highnoon Yasuo offer was a mistake?