Two different copies allocated the same ascension number

[finisfun]

Hello Team,

Lately we have observed that in our library (https://thebooklounge.librarika.com/) there are several instances where two copies share the same ascension number.
Example: Book Title ID 6648521 and 6648522 both have the same copy with ascension number 10001012 (copy id 8775595, 8775594)
Could you please help us understand if this is a bug, or if this has been caused due to wrong cataloging process from our end? Or, is this a expected behavior from your end - please help explain the scenario, since we are generally using the Ascension number as the unique identifier of copies in our library.

[finisfun]

Hello Team - Could you please address this?