For reference if anyone needs it,
[BUG] Adding additional network interfaces causes access issues · Issue #610 · linuxserver/docker-swag
Issue fell back on the Docker network motions, when using a vlan docker doesn't respect any port mapping requests and will default to this IP due to how Docker handled networks.
This is why the ports failed to work on the Docker network along with why the system preferred the vlan it was allocated.
Final workaround was mapping all ports from the 1443 to the 443 the container used by default as the VLan it was allocated does not use the port redirects.