They swept wrong. You shouldn't attempt to move part of the balance on a paper wallet. You execute a Tx to move the entire balance to a new private key in your hot wallet. Then you spend what you need to and after you can send the remaining funds to a NEW paper wallet.

It's important with paper wallets to know what format the private key is in. I don't like mnemonic seed phrases because not all wallets support them, and they are just a derivation of the private key. What you want to have is the actual private key, base64 encoded. Any wallet app that won't let you import a base64 private key isn't worth using.

Reply to this note

Please Login to reply.

Discussion

I agree, but as You know, anything that someone can do wrong with handling bitcoin storage, went already wrong by some people in the past and will go wrong later by other people.