DHCP–2 of 3 PCs getting wrong addresses

I have a location with 3 computers (2 desktop and 1 laptop). The laptop and 1 desktop are not communicating with our DC and are getting their IP addresses from a secondary DHCP server. When I hook my laptop into the port one of these computers connects to, I am able to access the DC just fine. I was able to join these computers onto the network, but then after they restarted they could not reach the DC.

Can anyone give me a place to start looking? I am not sure where to look next. Could there be something in the Cisco router that would be preventing these computers from getting through?