Email address display

I have 2 mail servers in cluster when I sent message from my home server to external email address, receipient see my email address in received message in following format: "FirstName LastName"email@domain.com but when I open my mail file replica on second cluster node and email same external person from that server he/she sees just my email address so “FirstName LastName” is missing from how it is showing up in receipients mailbox

why?