Website not updated when database changes

I went into the database to manually change my user description. However, I noticed that the setting isn’t being changed by the webpage itself. If I go in through WP to change it in the admin, then the user description gets updated. This is a problem for me as I’m updating html code which gets parsed to characters when I update through the admin panel.

Is there a reason why making changes in the database doesn’t immediately reflect on the webpage itself?