It's normal that a transaction is charged twice on my credit card? It doesn't appear as a pending transaction on my bank account, and it doesn't appear twice on my paypal account. This is really weird and i don't know what to do.
You say you have double charge on your bank account in the title of your post and then in the post you say you do not have charges (pending or otherwise) in your bank account but there are two charges on your credit card. Which is it?
One of them could be a temporary authorization. Contact your card issuer to confirm if there is duplicate charges on your credit card.