I took the index from the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, additional a few zeros to your 8 digits on the binary and obtained 00000010011 which interprets to 19 in https://throbsocial.com/story20667974/the-invalid-bip39-phrase-diaries