Unless you recovered a non bip39 seed into electrum and checked that wallet as BIP39. Then sent funds to it. Looks like this is what you did?
Might have happened, don't recall now. I don't have that feeling though.
But let's just assume I did it. I am absolutely certain - if I did it -
I did not change any derivation path. Thereupon once you check the BIP39 box, it comes always automatically the following derivation path: m/44/0'/0'
And yes, I do have some used addresses on this derivation path. You can see it on the picture above.
Wallet with the 6 transactions, on the right side, is with that derivation path.