Electrum windows will let me use words not on the list if I click the BIP39 seed option when entering the seed.
it seems you've
generated imported BIP39 seed in your windows electrum wallet,
Finally I'd like to point out that electrum never ever generates bip39 seeds so what third space is saying cannot be true.
You're right, my bad... I meant to say "imported" because he mentioned "entering" seed
I know the fact that Electrum doesn't generate but can accept (compatible with) BIP39 mnemonic seed
I was reading another thread,
quoted below, before replying yesterday's post
Electrum wallet itself is also compatible with BIP39 seeds... so while you can't generate a BIP39 seed within Electrum, you can still use a BIP39 seed (generated elsewhere) with Electrum to restore a wallet.