I took the index of your words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, added a few zeros into the 8 digits in the binary and obtained 00000010011 which interprets to 19 in https://sparxsocial.com/story9218871/getting-my-bip39-words-to-numbers-to-work