Opencart Cache Issue | Web Hosting Talk

We have installed OpenCart version and this version seems to have some kind of cache problem. When we try to load any image from Catalog >> Products, it does not show the loaded image instantly, but the image has already been loaded. The same goes for file deletion, it is not updated instantly. It is taking some time to update.

We have tried to install previous versions and it seems that they have no problem. Guide what might cause this problem and what should be done to fix it.