Yes, this is normal. When we send emails out of OwnerRez (to the guest on your behalf) we use your email address as the REPLY-TO header. When the guest replies, their reply goes back to you directly, not to OwnerRez. We do this on purpose to keep the communication between you and the guest. We have designed and worked on some "Unified Inbox" stuff but it's been back burner'd several times. It's a major undertaking and not necessary for a lot of users. It's something that needs a lot of work to really get right and be useful, otherwise it just gets in the way.
PS. You can have your email address be set the FROM header too, but you have to join our Verified Sender program to do that (which is free but requires setting some DNS records with your domain registrar).
