It appears that the only images with generic icons are those that are on your iCloud folder. Bridge has never been designed for working in the clouds. To resolve this, download the images and you'll be fine.
The fact that you're getting an image is a plus. Seriously, Bridge was not designed to work with images in the clouds. It wants direct access to your images over a wire or a board. If you want to see real fun, a server is a way to go (not).
Personally I'm not against cloud service but I use if for absolute calmity: I have a 4TB drive that contains all of my images and important documents (call it Drive A). I have a 2nd 4TB drive that I use to backup Drive A. I also have a 3rd 4TB drive that I use to take advantage of Apple's Time Machine. All of those are only good against hard drive failure but do nothing for a house burning down. That's where I use a cloud service. I back up my computer and my Drive A, everything else is redundant.