I think it was announced here a while back: https://www.epicbundle.com/
I am wondering how did you know about the bundle? Couldn't find the link to it in any of the menus. Surprised they have such good bundles.I noticed that at https://www.greenmangaming.com/gamesaid-charity-bundles-2018/ if you open up the alpha and the beta bundle there via 'view more' that both will redirect to the beta bundle, so that has to do with it. They linked incorrectly, so I assume you simply added the first bundle to the basket or opened the alpha bundle there via 'view more' and then the beta bundle popped up which you bought. Especially for those who just add the product to their basket, they probably do not realise that GreenManGaming linked incorrectly. The proof is right on their own website. It is indeed very deceptive.