[syslog-ng]syslog-ng and snmptrapd keep original hostnames

Hello, We have 2 syslog-ng relay servers and 1 syslog-ng server. We also use mysql. So the 2 relay server sending al messages to the syslog-ng server So when a switch sends a snmtrap to the relay server it forwards the message to the syslog-ng server. When I look at the messages I don't see the hostname of the switch in the Table HOST. Instead I see the name of the relay server. Is there a solution for this ? Dirk