[Pulp-list] pulp 3.2.1 duplicate key error

[Bin Li (BLOOMBERG/ 120 PARK)]

Noticed we have a few errors when running sync.

            "error": {
                "description": "duplicate key value violates unique constraint \"core_repositoryversion_repository_id_number_3c54ce50_uniq\"\nDETAIL:  Key (repository_id, number)=(59eb02b1-edab-46e3-a69b-d69a8b314f20, 2) already exists.\n",

What could be the cause of this? How can we resolve it?
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