I have the same Problem.
@ Liroy Kielce: How can we redem without knowing the Steam-Key??
As lolocjusz11 said: The page reloads BUT there is no Key, instead of a Key there is again the Button "Unlock Key" whitch you can press again and again... as often as you have some stamina left.
They've fixed the unlock button on my profile page.
It works now ,but guess what ? no keys left !
It will probably be mysteriously broken for the next offer too and will fixed after the keys have gone
Listen.. the free keys are great and it's very nice of DLH to offer them but when the website doesn't work or can't stop bots from taking all the keys ...well it just makes people angry which has the opposite effect that DLH wanted.
You want peeps to visit and leave with happy memories