Seems like it might be a bug in the driver. Can you insert some data using the driver and query it from that datacenter either via the driver specifying a DC aware load balancing policy against DC-Ffm-2 with consistency LOCAL_ONE? or if that doesn't work, using cqlsh on a node in that datacenter with CONSISTENCY LOCAL_ONE?
Also double check that the DC name reported in status is *exactly* the same as the DC name in the replication details.
