It gone because if mixing wallet mnemonic seed and many random words which are not wallet mnemonic seed words.
OP has no chance to find 12 accurate words of his wallet but to avoid similar mistake in wallet backup, he will need to read.
How to back up a seed phrase?One point can be taken from it.
Loss due to complexity / not being able to restore from backup
Complex your wallet back up will not make your back up safer but more risk of failure in recovery later.
Don't split your wallet seed too.
Why seed splitting is a bad idea?