Great, just make sure that the PC Electrum version was verified and/or came from the official site (
electrum.org) and you should be safe.
It's better of that way since it's super weird that your SEED failed to produce that particular address (
even "ismine" command resulted in "false").
It's possible he was using a BIP39 seed and just selected the "default" option of "native segwit" (aka bech32 aka "bc1") addresses when he tried to recover using the latest Electrum, as that is what the wallet creation wizard defaults to after you end your seed.
... When I installed Electrum on another PC of mine using the seed from my tails wallet, it connect right away and shows all of my old transactions. It does not show the tails receive address I Used, however, and does not show the new transaction in history tab either. My balance is showing 0 BTC still, and I have been leaving Electrum on and connected throughout the past couple days to see if it would update at some point. Any ideas on where the heck my coins are? Thanks in advance!!
Do the addresses on the new PC with the latest Electrum start with "bc1"?
Did you create the seed with Electrum? Or is it an imported BIP39 seed? If it is BIP39, then for future reference, to recover your old wallet on the new PC with the new Electrum with your old seed... you need to ensure that you select the top option that says "legacy (p2pkh)" after you have entered your seed:
However if it was an Electrum seed, then I'd agree that is VERY strange that your seed is generated addresses that don't match... I'd suggest looking at the wallet on the Tails machine and using "Wallet -> Seed" option to actually double check that you have backed up the correct seed!