If you notice that you have made changes and it is not being updated while you are accessing your website, it is because of old cached info.
You can handle caching in Prestashop in the following ways.
Method 1
Step 1: Log in to the Prestashop admin area.
Step 2: Advance parameters > Performance.
Step 3: Choose Force compilation and disable cache and save the changes.
Step 4: Refresh your website and check out if changes are updated or not.
Method 2:
You can clear the cache manually by deleting the following folders from the Prestashop site root folder.
- cache/smarty/compile
- cache/smarty/cache
- img/tmp
Before deleting please save the latest back up of your store in your local which you can restore later in case of any failure.
Please make sure you don't have to index.php file.
Refresh your website and check out if changes are updated or not.