I am not sure, what you mean by the description but here is a stab at it.
Sounds like you may have a hardware configuration issue, on UCS there is no need of removing the cables. The intell is in the fabric interconnects. Also sounds as if you are not using a full chassis, if that is the case then i would review where the servers are in the chassis. The ucs system cannot use 3 cables only 1,2 or 4 when doing so the server population adheres to the physical binding determined y the Fabric Interconnects.
it could be an ip issue.