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Thanks Bruce,

The effect can be replicated on the attached .annot in fsaverage space.
Step 1: 
MacBook-Pro:label chris$ mris_divide_parcellation fsaverage lh ABCD_task_p001.annot 1600 ABCD1600

Step 2:
MacBook-Pro:label chris$ mris_divide_parcellation fsaverage lh ABCD1600.annot 400 ABCD400

You should find that the large ventral temporal cluster in lh.ABCD400.annot has three of pairs of discontiguous clusters with the same label name.

Thanks for your help!