Thank you once again for your response. I tried importing on my electrum and did the detecting account after entering the 12 master seed and it confirmed it was for the BIP39 but I still got the same result.
-snip-
Once again, thank you. I will be open to trying more options if there are some.
Then it means that the newer transactions aren't included to your seed phrase's other account_index derivations.
There's one last thing to try, after this, it's mostly guesswork of what could've happened since there's nothing to reference it from.
My last suggestion is:
It may have been caused by overshoot of "
gap limit" resulting with the newer private keys/addresses that you have used to be outside of most wallet's default gap limit (
e.g.: Electrum = 20)
For that, you may try to manually derive thousands of receiving and change addresses in that restored wallet in Electrum (
with old transactions).
To do that, open the 'Console' tab (
"View->Show Console" to enable the tab)
Then type these commands (
Electrum will resync with each command):
[wallet.create_new_address(False) for i in range(5000)]
[wallet.create_new_address(True) for i in range(5000)]
The former creates 5000 more receiving addresses and the latter does the same but with change addresses.
You may edit the range but don't set it too high or the server that you're using may enforce DDOS protection against your client/IP.