problem with permalinks

hi.. i “play” with permalinks in the admin panel to change the links like

/%category%/%postname%/ and work nice.. my old configuration is the

/%year%/%monthnum%/%day%/%postname%/

now when i change my new permalinks configuration to my old configuration, the changes dont take efects

when i see some categories i see

https://www.mysite.com/categories/mycategories/mycategories1/

and when i see the post i see the correct permalinks

https://www.mysite.com/year/month/day/postname/

how i can fix it?

and now the changes dont