I took the index with the words, transformed the selection to binary, added three zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, extra 3 zeros to your eight digits with the binary and obtained 00000010011 which interprets to 19 in https://bookmarkedblog.com/story19640422/considerations-to-know-about-bip39-seed-phrase-generator