Parent Interfaces missing

[tuxip 0]

Hi.

I am trying to set up VLANs on my Netgate 1100, but when I try to assign the VLAN to a parent interface (LAN), I am only able to select one parent interaface (mvneta0).
When going to Intefaces->Assignments I see that all three ports on the 1100 have the same interface (mvneta0).
My 1100 is connected to a TP Link managed swithc from the LAN port on the 1100 to port 8 on the switch, and I intend to use port 8 for trunking.
When I check on the Status->Interfaces page I see that all three NICs (WAN, LAN and OPT) are listed with the same MAC address.
Any idea why the Firewall has only one interface, and how do I correct this?