Duplicated clusters
The EMTF is seeing duplicated GEM clusters in its DAQ path. Duplicated in this context means that the exact same cluster (size, partition, address) is reported multiple times in a given BX.
Building such a cluster is impossible (right?) and the CPT7 only forwards the data without any additional processing. The process of how such events happen is not understood. the cluster DAQ might help to understand if the issue is on the GEM or on the EMTF side.