I took the index of your words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, included three zeros to your eight digits with the binary and obtained 00000010011 which interprets to 19 in decimal. https://health-lists.com/story19419255/invalid-bip39-phrase-things-to-know-before-you-buy