I took the index with the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to transform it to binary, added 3 zeros to your 8 digits of the binary and received 00000010011 which translates to 19 in https://my-social-box.com/story4391612/new-step-by-step-map-for-bip39-english-words