no problem, glad i could help. and i am just paying it forward. somebody helped me in early days when i just started using bitcoin and now i am using all that information to help others

so it is as i suspected. a bug in blockchain.info!
you imported your private key a long time ago and that private key was an uncompressed private key (started with 5) and now blockchain.info has converted that into a compressed private key (starting with K). that is why the public key and the base58 (or bitcoin address you've got = 1Emhxm...) is different.

now all you need to do is to convert that compressed key to the uncompressed one.
to do that, the only trusted tool that i know is https://github.com/pointbiz/bitaddress.org
you can see the live version here: https://www.bitaddress.org
although you MUST take a copy of the project and run it offline for security reasons.

open it, then get rid of the address generation step (move your mouse around until it shows 100% complete.
then go to the wallet detail tab and paste in your private key (KyF21...) and click View details button.
scroll down and find the private key which is starting with 5 and copy that in electrum

edit: a picture help:

just a weird thought but if you have ever spent anything from that address (1Fy8dvuHjiTL...) you can use the below link (complete the address in the link) it can show you the public key of your address. and if it was long (130 characters) instead of being short (66 characters) that means the private key that blockchain.info gave you (KyF21...) is a wrong one and it should start with 5 instead!
https://blockchain.info/q/pubkeyaddr/1Fy8dvuHjiTL.....

- read more about compressed and uncompressed here: https://bitcoin.stackexchange.com/questions/3059/what-is-a-compressed-bitcoin-key
- use this tool to count characters faster http://string-functions.com/length.aspx

OP seems to not understand the difference between "Sweep" and "Import"

"Sweeping" creates a transaction that sends the coins from that address to your new Electrum (or any other) address that you choose... thus, it will have a different private key and different address.

The only way to maintain the same private key and address is to "import" the key... and this is not possible into an Electrum HD (aka "seed based") wallet... you can only "import" into an Electrum wallet that you specify as being based on public/private keys when you create it:

"File -> New/Restore"... give it a name... select "Standard Wallet"... then you should see this:


DO NOT select "create a new seed"... instead, make sure you select "Use public or private keys", click "next". Then put your private key into the box on the next screen and click "next".

Your wallet will be created with your "old address" and transaction history and balance for that address.


NOTE: It is NOT recommended to import, as this new wallet is NOT an HD wallet and so it is not backed up by a 12 word seed phrase. You must therefore make regular backups of the wallet file and/or private keys so that you are able to recover your coins if your computer blows up or your hard drive dies etc.

Sweeping is a much better option!!

Blockchain.info could have yet another bug in their wallet (it's a common occurrence for their wallet to be full of bugs) which is displaying the incorrect private key.

Alternatively you are looking at the wrong address or the transactions to that address have not confirmed yet.