Data is flooding my network when cameras are being recorded

Greetings,

I apologize if this gets lengthy.  I will try to give as much detail as possible.

I am currently running 6.1.0.42176 of DW's variant of NX on three servers.  

Server 1 is at our headquarters (Building 1), running on Server 2019 and is currently recording 106 cameras, all at 20 FPS and recording motion only.  

Server 2 is at another facility (Building 2), less than a mile away.  It is also running on Server 2019 with 144 cameras, all at 20 FPS recording motion only.  Building 1 and 2 are connected by a Spectrum EPL capable of 500Mbps up and down.  

Server 3 is multiple states away in building 3.  This is also a Server 2019 install, with 69 cameras.  Building 1 and Building 3 are connected via a site-to-site VPN, both running on 500Mbps fiber.  

In the case of buildings 1 and 2, all cameras and servers are segregated in a VLAN, with only camera and NVR traffic on the VLAN.  The servers also have an additional network connection connecting them to our Office VLAN. 

When I enable recording for Building 2, I see a traffic flood my EPL link, which shouldn't be happening.  The server in Building 2 is only recording cameras that are also in Building 2.  There are no cameras in any of the other buildings being captured on Server 2.  This flood of traffic causes a bottleneck and kills the flow of traffic for everything else.  

I'm asking for suggestions on where to look to see why this data is going across the EPL and how I can clean it up.

Thank you