Could be humble's gift link system not working. I had the same problem, bought a gift for my friend, didn't work, contacted support and they gave me another link. Not sure if support will give you a new link for a free game, and it's a hassle.
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I have many of them to give to other ninjas. Today I decided to post my Tropico 3 Gift links and I come back after a while and see that my links aren't working. They don't show a gift redeemed page or thing like this. Humble said I have time since 6 October to redeem them but today is 25 September:
""Be sure to remind your friend to redeem this game to their Steam account before October 6, 2014 @ 10am PT. Once it is redeemed on their account, it is theirs to keep, but the key is only available for a limited time"".
You can test one of them yourselves:
https://www.humblebundle.com/?gift=Sr8MNmebzuUKCtHW
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