In Arabic Wikipedia, Special:Log displays only the most recent 15 000 items. When clicking next again the same items are displayed again. This is true for deletion log and user creation log (the only 2 logs which have more than 15 000 items). For example deletions in arwiki older than February 2007 are not displayed. I have noticed this also in English Wikipedia in the upload log (didn't try other logs).
Version: unspecified
Severity: enhancement