The card is not in the place it should be [graphical bug]

So, basically here's what happened to me:

Yesterday I opened the lunar revel shop, clicked on all the cards and for I don't know what reason, a Tryndamere skin with 70% off came back today.

So what today I did was:

• I opened the client and logged in
• I opened the lunar revel shop
• I clicked on that Trynda card that came back
• After clicking, but before the animation ended, I clicked on the main menu button
• From the main menu, I clicked on the lunar revel shop again
• The card was not in the place it should have been, it was slightly under the card on its right,which was a Soraka skin with 50% off. (The Trynda skin was the 4th in the line and the Soraka skin was the 5th)
• After this I came back to the main menu and opened the shop again, and everything was back to normal.

I can't reproduce the bug, because now I clicked on all the cards.

Sorry if you found spelling mistakes or languege mistakes in this text, I'm not English.