Opencart cache problem | Talk Web Hosting

We installed OpenCart version and this version seems to have a cache problem. When we try to download an image from Catalog >> Products, it does not show the downloaded image instantly, but the image has already been downloaded. The same goes for deleting files without the instant update. It takes a while to update.

We have tried to install previous versions and this does not seem to be a problem. Please indicate what might cause such a problem and what needs to be done to solve it.