I took the index from the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, added 3 zeros to your eight digits in the binary and obtained 00000010011 which interprets to 19 in https://bookmarklogin.com/story19730025/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator