TLS 5 second delay before establishing TLS client Hello

I have to say I'm at a loss. Unless I'm missing some detail, or there's something unusual about this configuration, there is absolutely no reason why a CLIENTHELLO message would be coming from the server side of a TLS handshake. Is there an iRule? Is there anything going on in the web server's application logic that might be causing a reach-back? Can you post the network capture from both sides of the F5?