Router Hooked Up Backwards?

I live in an apartment building where the internet is provided via an ethernet port in each apartment. The internet is fed into the building from a single location from a company called NetLogic. Well, the connection's been spotty lately, with plenty of people unable to connect. The company finally came out today to check things out, and they said a router was plugged in backwards, causing the network to fail.
Can somebody explain to me how a router can be plugged in backwards? I mean, you run ethernet from the port in the apartment to the WAN port in the router. Its as simple as that. How can a router be plugged in backwards, and how does that cause a network to fail?

Well, I guess someone connected the router not with the internet port but with a numbered LAN port to the network.
This kind of connection is useful if you want to use a wireless router as access point to an existing network. Wireless clients are bridged into the existing network.
However, if you do this you must not forget one very important thing: turn off the DHCP server on the router hooked up this way. If you forget this, the DHCP server on the router will assign IP addresses to devices in the network. However, it will always use its own IP address as internet gateway address. However, the router is not connected to the internet through the internet port and thus does not operate as gateway. Any computer which gets an IP address from this router will have no internet. With two operating DHCP server in an network it only depends on which DHCP server responds faster. Depending on that you get either the correct gateway address from the correct DHCP server or the wrong gateway address from this other router. Which one it is is impossible to predict.
I guess this is what they have meant when they said "backward"...

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