You must absolutely make sure that each DR has its own, unique IP address, and ports, especially when accessing remotely. I know your saying it is on local network, but still be 100% certain the HYBDVR and TRIDVR have different IP address, and ports, specifically HTTP, TCP, and UDP ports.
For example:
HYBDVR - 192.168.1.108, HTTP:88, TCP: 37777, UDP: 37778
TRIDVR - 192.168.1.109, HTTP:99, TCO: 47777, UDP: 47778