When you install a new theme, it's a good thing to clear the cache of your Prestashop installation, so you can erase code coming with your previous theme.
1. Access your administration
2. Go to Configuration > Advanced Parameters > Performance
3. Set "Template compilation" to "Recompile templates if the files have been updated"
4. Click "Save"
5. Disable all CCC functionalities
6. Click "Save"
7. Click "Clear cache"
Be sure that "Caching" section is disabled.
Sometimes it may be necessary to reset some modules.
If the problem is not resolved, the culprit could be a third-party module.
Last Updated: 29 Oct 2019