we don't understand what we see with Conversation OUT Report with NetFlow Analyzer v. 9.5

we  configured sFlow on switch HP Procurve as below:

On port A2 there is connect only one Server (we see only one mac-address); when we generate a Conversation IN Report and Group By Source IP we see only IP address (this is correct), but when we generate a Conversation OUT Report and Group by Destination IP we see more IP in addition Source IP.

Do you know if this Conversation OUT Report is correct?

Thank you.

Regards,

Marco