Hi,
First of all, I did not run simulation, but i could see that the setup of Coaxial wave port is wrong, i just see you have assigned two lumped port on the face of inner conductor of two different coaxial port. Definitely, it is not an usual practice of creating wave port.
please bear in mind that, wave port is a source of wave that feed into your structure externally.
Lumped is source of signal that feed into your structure internally, I will suggest you to create wave port first~
best regards,
le