Why some line of get ledger Entry line change events does not exist

Hello, I don't understand why, when I request the logs of the last hour via the GET ledger Entry line change events API, it returns me the list of changes. However, when I try to search for them later with the List Ledger Entry Lines API that are matched to a given entry line, some of them do not return any results, even though they were inserted without being deleted later. Thank you in advance for your answer!