I took the index of your words, transformed the amount to binary, added three zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits in the binary and received 00000010011 which interprets to 19 in https://telegra.ph/Unlocking-the-World-of-BIP39-A-Comprehensive-Guide-to-Mnemonic-Expressions-and-Word-Listings-01-17