The wallet (software) version is/can be different from your wallet FILE version.

Also : there's no reason to delete/uninstall anything really.
Here's what you should try, in my opinion;

1. You should import your seed first to see if you actually generate the right wallet, containing all of your bitcoins (it should! just to make sure!)
Once you imported your seed (with Restore -> "name your "new" wallet" -> "Standard Wallet -> I already have a seed")
2. You should go to Wallet -> Information, and see if the MPK is updated. (I haven't looked into this, so it might not change, even after "restoring"..)

3. If not, you need to generate a new wallet (new seed.) (You can choose between Legacy and Segwit. Legacy is 1.., and segwit are the newer bc1... address, which lets you save on transaction fees.)
4. Then, check if the MPK is correct in the new wallet. (Either xpubXXXXX for a legacy wallet and zpubXXXXX for Segwit  (Actually, you can't use Segwit for multisig as it'll generate a zpub instead of the required Zpub), so, stick to generating a new legacy wallet.

5. and then transfer all of your bitcoins to the new wallet.

Don't delete any wallet files, or even uninstall Electrum, as i don't think that's the issue here.

Where are you getting your master public key from? How old is your wallet file?
If you upgrade electrum while you still have a wallet file that uses < 2.9.3 wallet formats, the master pubkey (might be?) different.


Is that the case here?

Does it look like this:


https://www.reddit.com/r/Electrum/comments/79rucr/my_master_public_key_doesnt_start_with_xpub/


If not, please verify your electrum.org binaries - https://electrum.org/#download , otherwise; have you tried creating a new wallet?