broken images

Hi,

I am a novice and not really a computer guy. I am maintaining a retail site for our family owned furniture store and attempting to load more images into a gallery. The hi res (300dpi) I was using from a vendor were working fine but now, if I go to upload new ones they won’t show as thumbs but open fine when you click on them. I can get the lo-res ones to work but they are too grainy. The images open OK on my computer so I don’t think that’s a problem. I’ve downloaded images from other sites and don’t seem to have the same problem with them. I’ve tied resizing the images but that doesn’t work either. I think this is a simple fix but I can’t figure it out. My site:
https://www.carlsonsfurniture.com
the specific tab I’m having issues with is “living room” if anyone would like to see what I’m talking about. Any suggestions would be greatly appreciated.

Thanks,

Dave