Hi,
The fact that you see the "browse" button below the image area means that the uploader javascript system couldn't load on the page. This usually happens when there is a javascript error on the page.
In some less common cases, no javascript error is displayed even though there is a javascript conflict between the javascript libraries on the page. You could try to install and configure the extension jQuery Easy which can fix such conflicts, even in the backend.
I don't see any other reason and if that doesn't help, we would need a backend access to be able to look at the issue since it doesn't happen by default in HikaShop.