There has been some concern about credit cards being charged twice by Kickstarter.
Kickstarter has informed an inquiring backer that, “Backers are not charged until the moment a project ends at or above its goal. It’s possible that you’re seeing the temporary authorization of funds, which allowed us to charge your card for your pledge at the project deadline. This authorization should drop normally after a few days. Feel free to reach out to your financial institution for further clarification.”