Why doesn't adding categories via sql work in DLE?

Question

MySQL

When I make an sql-query to add categories to the news, the categories are added to the news, but the news itself is not displayed in these categories. The news will be displayed only if you delete the categories in the news through the admin panel and add them again. What could be the problem ?

SQL query example: UPDATE `dle_post` SET `category` = '35,108,111,117,39' WHERE `dle_post`.`id` = 7433;