I took the index from the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to transform it to binary, additional three zeros to your 8 digits of your binary and bought 00000010011 which interprets to 19 in https://socialbuzzmaster.com/story4742587/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting