The remote IP address seems to connect to different hosts via reverse NAT, or an intercepting proxy is in the way.
Reverse NAT is a technology which lets multiple computers offer public services on different ports via the same IP address. Based on OS fingerprinting results, it seems that different operating systems are listening on different remote ports. Note that this behavior may also indicate the presence of a intercepting proxy, a load balancer or a traffic shaper.
Make sure that this setup is authorized by your security policy