Have you tried without putting the key prior to creating the giveaway ? Just suggesting a random change to see if it helps. I don't see why it would be a problem but, who knows. Otherwise, clearing cache and cookies might help.
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Well, select "gift", so you don't have to put the key in the field.
"You can also select gift if you wish to add keys after the giveaway ends, rather than now."
Then, you just have to contact the winner yourself.
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Humble links need to contain "?gift" in the URL to be accepted.
To make a giveaway with your link, you'll need to select gift and give the link to the winner via Steam chat or mail.
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Yes, I have already done a giveaway with this kind of link.
I added the winner and gave him the link in the chat.
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Humble Bundle gives links in different formats, but I think only one is accepted by Steamgifts. You can try changing "downloads" for "gift" (https://www.humblebundle.com/gift?key=) and see if it works. I did it once without any problems when I had a similar situation.
And if it doesn't work, you can always give the link directly to the winner via Steam or e-mail.
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As @TempeteJoachim said, be sure to use the ?gift format. Be very careful giving links in the downloads? format, as they're grounds to have your Humble Bundle account revoked.
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