The rapid weaver resource folder has always had a lot of issues. For one thing you can’t drag and drop from it, but must use a “macro” to access the images.
If you drag and drop the same image to different stacks Or page, RW or web browsers will treat them as different images. No way for RW or a browser to know it’s the same.
This is one of many reasons why many users use server stored images aka warehoused. Might want to have a look at this free ebook.