Summoner Icon Frustration

For some reason, no matter what I set my summoner icon to, it will constantly revert itself back to this Lux summoner icon. Does anyone know why this is happening or how to prevent it? No matter which other icon I choose, it will just randomly revert back, usually after a match but sometimes even just from going in and out of the store / my loot.

https://imgur.com/NLGGmrL