I took the index of your words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added 3 zeros on the 8 digits with the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarksparkle.com/story19150917/getting-my-bip39-words-to-numbers-to-work