you have removed the specific item from the database but the item data still exist in your player's database.
ensure you clear all the related items in both your server database and player's database...( ex. inventory / cart / storage...etc.. )
https://rathena.org/board/index.php?/files/file/2505-%7B?%7D/
or http://rathena.org/board/topic/77378-skillitem-map-restriction-now-supports-multiple-maps/