Please add more information to your question. What code are you calling? What are you trying to do. What do you want to get refunded for? Its not possible to answer this question like this.

Could you maybe log the transaction and add that to your question? console.log("Transaction Signature:", tx); Also how are you calling that transaction? In a test? In the web? Can you add your client code as well please?

Are you requesting a new block hash between the transactions?

How do you get the blockhash for your transaction in anchor and how when you call the native program?

I didnt know there was such a limit. Maybe you can open an issue and ask if its possible to increase the limit: github.com/coral-xyz/anchor