Was this an older version of Ledger?
At one time (several versions ago), the program created new files for each batch. If data was restored from a backup, that files were not overwritten and were, in effect, orphaned. This could have happened in a previous year.
I believe that upgrading the the latest version, 9.1A, and converting the data will allow you to run the Data Integrity check and "rebuild" to delete these unwanted batches.
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Ralph Allan
Business Computer Centre
Prince George BC Canada