Giveaway disappeared?

Ask Support.

thanks, i will do that

Maybe they thought it was a bundle key?

Because it is most likely a key from a bundle and they are not allowed. You can make a giveaway for the entire URL, but not individual leftover keys, where you can farm contributor points.
Edit: It looks like you got away with 2 key giveaways already. You are risking a ban. Read the site rules.

oh i did not know that, maybe i should have read the faqs ^^ thanks for your answers