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TCP client responses with no FIN

Hello there, I am testing a TCP server application I am writing. On the PC side, I am using a TCP Client for testing purposes. In this scenario, After the client makes the connection with the server and exchanges some data, the server is initializing the closing. This is done by sending FIN+ACK from the server to the client. The problem I am having is the the client responses with ACK and never with FIN+ACK. Here is the screenshot and transcript (cannot upload files here). is the server and is the client. Why isn't the client sending a FIN+ACK after the server initializes the closing? Is this a bug in the client software, or is there something wrong with the server sequence?