Error on post simple form

Hi bros,
i have one issue with the form post on CI3, it reloads the page, when i try to delete it works fine.
What might be the issue?

Check this: https://www.codexpedia.com/javascript/su...-the-page/

Check your .htaccess file

Can you share some of your codes, for example form start tag from view, your method in controller and even your route if you have any for this post process?