Changes are not visible on home page

Hello guys,
I'm new to CI and I have one heritable website. So the problem is that when I made changes they are not visible on home page or they start to be visible after a long period of time.

For example:
Let's say I change site_email in application/config/settings.php ( $config['site_email'] = "[email protected]"; ) and it is visible on all of site pages except home. On the home page is still visible the old email address and maybe it's gonna change after a long time ago.

Can you help me with this if someone can suggest something that I can check?

Regards!