We've identified a bug in DSpace 6.3 affecting the "Browse by Author" and "Browse by Subject" functionalities. When we search for a specific alphabet letter, such as 'C', the first page of results for that letter appears correctly. However, when we attempt to navigate to the next page using the "Next" button, it incorrectly redirects us back to the initial alphabet letter 'A' instead of displaying the subsequent pages for letter 'C'. This behavior is inconsistent with the expected functionality, as seen in the "Browse by Title" feature.
For reference we have attached the screenshots.


Could someone please provide guidance on resolving this issue?