I was poking through my order history just now; on 2017-06-02 I bought Fallout: New Vegas Ultimate Edition, original cost AU$23.99 discounted to AU$11.99.

Then on 2017-06-09, there's another listing for Fallout: New Vegas Ultimate Edition, this time listed as $17.86, discounted to $0.00. When I click "View Receipt", the discount is listed as "FALLOUT NV GIFTING - PACK", and the message at the top says:

"We've made changes to some of the items in your Library. Don't worry - no games were harmed during this process. If you're interested in further details please visit the game's forum".

...but I can't see anything relevant in this forum. What's going on?

Screwtapello, hello to you.

Recently, GOG simply changed internal labels for Fallout 3, Fallout: New Vegas, and The Elder Scrolls IV: Oblivion, so that purchasers of any of those games would be granted copies of Bethesda's 'The Elder Scrolls: Arena' and 'The Elder Scrolls Chapter II: Daggerfall'; Upon launch (the 1st of June), this was not the case (unlike all of the other Bethesda games). So, it was necessary for GOG to re-add the game(s) to our accounts in such a manner.

Previously, I had also wondered why Fallout 3 and Fallout: New Vegas were being 'gifted' to me, after a week had passed by since I had purchased them. (^_^)

Edit: Screenshots added.