Giving away won gifts.

Yes. Ask for reroll if you won it twice.

You won the game one week ago, and still you entered the developer giveaway... Don't enter giveaways of games you already own. someone else without the game could have won it and be playing it right now.

Normally I'd say "ask the giveaway creator to re-roll", but since your second win was from the dev giveaway (which I'm pretty sure you can't re-roll) then I have no idea...

Actually, here's an idea- maybe you can ask the creator of the first giveaway to re-roll and (since you probably already activated the copy he gave you) give him the key from the dev giveaway for the new winner. Ask support if that would be ok. If it's not... well, don't re-gift because that leaves you worse off.

And in the future do make sure you un-enter giveaways for games that you obtain. <.<

I will probably gift it to random friend. Not trough steamgifts.