confused how actually 4 way handshake work

Captured handshake and password have been found using brut forcing tools of kali Linux now i interested in how its work so i did following steps:

• Generated PMK form PSK and SSID using online calculator
• Generated PTK using online calculator HMAC-SHA-1 from following input
• Data = Min_MAC Address, MAX_MAC Address, Min_Nonce, Max_Nonce.
• key = PMK
• from which i get 384 bit PTK
• this PTK divided in three parts (KCK, KEK, TK)
• KCK encrypt with KEK by using AES-128 using online calculator where data
• data = KCK
• key = KEK
• That KCK should be matched with the MIC, i founded using kali Linux tools (the MIC of second packet of handshake) which is not the same

Now the question is! What I missed here please help me I m so tired