Many thanks to MadBrat :)

Hi MadBrat, I just received your Steam key for this game and unfortunately Steam reports it as already activated. :/
I'm relatively new to Steamgifts and currently don't know how to act properly in those cases.
Do you have any idea why it is a duplicated key?

Hey MadBrat, I see you are online now and I'd like to get in touch with you. I also sent you a friend-request on steam.
Sadly I'm not able to mark the giveaway as "received".

Why? what went wrong?

Hi, your Steam key is already activated aka duplicated. I don't know why. It's the first time I encounter such a case on Steamgifts.
I did some reading in the forums and the recommendation is to get in touch with the giveaway creator to sort things out.
Here are the topics I read.
https://www.steamgifts.com/discussion/yvbBK/i-won-a-duped-key
https://www.steamgifts.com/discussion/P7c0e/won-giveaway-key-already-activated
https://www.steamgifts.com/discussion/V3ikx/what-to-do-when-steam-key-is-already-activated-by-another-account
I mainly participated in your giveaway because the odds were good and I'm interested in collecting all kinds of different games that look fun, but I don't really bother with this particular game so I would agree on deleting this giveaway.
I'm so sorry for the circumstances, but I cannot mark the game as "received", because I'm unable to activate the duplicated key and therefore the game is not in my library and that would be a steamgifts-infraction.
I don't know from which source you got the key, but you may get in touch with the store support and report that the key was already activated and they can check the background then. ;)
Of course you can refuse my friend request on Steam, I did this to get in contact with you because initially you did not pay attention to my messages here.

I'm sorry about that. I got the game in a Fanatic.com bundle. I will contact them to see what they say and I'll let you know as soon as I hear anything. If they don't sort it out I'd be happy to get you a new key since you entered and won fair and square.
Thanks for contacting me about this so we can get it sorted.

Well it didn't take me long to figure out what had happened. I put the wrong code into the system. I have changed the key and resent it so you should now have the correct (and working) key. Sorry you got messed about. I hope you enjoy the game.