Are the ports in pairs at each location? Then it sounds like they did a Very Bad Thing and ran one cable per pair of ports; 100Mbps uses two pairs, so why use two cables when one cable has four pairs, right? :( I've seen that a lot in much older installations, but I'd expect better from 2015 construction.

I'm busy retrofitting Ethernet in my house by pulling cat6 through the walls and pulling out the old cat3 phone cabling. It's much harder work doing two cables (not least because none of the phone cables were in conduit, so it just starts off harder already) for each pair of ports, but it's very much worth the effort.