Around 00.37 Feb 12 (23.37 UTC) Feb 11, one of the admin on it.deleted two images. Now... there is no entry in the log and if you go to the deleted images via Special:Restore, you don't see a their deletion...
The problem has been temporary, now the log works correctly, I've checked and if I delete a file, the logs are ok, both on the page and in Special:Log/delete
You can see a sample of this problem at
http://it.wikipedia.org/wiki/Speciale:Ripristina/File:Interno_pieveacquedotto.jpg
http://it.wikipedia.org/wiki/Speciale:Ripristina/File:Pieveacquedotto_esterno.JPG
Version: unspecified
Severity: normal