I cant understand how my casascius bar could still have btc in it

If you click on one of those transactions where i transact out of the casascius address, thats a 2015 transaction. Further from that you can find transactions on 2016

And thats where i found the 3K address.
https://blockchain.info/address/3KYEMZfWaGSsNKj8ypR9xLzYmUDQyGeMFGI mean i didnt send anything in 2016, i only checked my wallet.
Whats going on?