Yes, you can use cache plugins if you want.
Why some images may not be cached properly?
There could be a variety of reasons for this.
– Cache plugins might not cache all images equally. For example, images in certain directories might be excluded from caching or might not be processed properly based on cache settings.
– Some images may have a shorter cache lifespan or might not be cached at all due to incorrect cache expiration settings in the plugin.
– If the caching plugin or server configuration is set to only cache images for a certain period, it might lead to inconsistent behavior depending on the browser or page load.
