For each version it says "Card image cap" under each title. Looking at the HTML the src attribute is empty. I've tried both with Firefox and Chrome.
Can't reproduce. Perhaps try https://manjaro.org/get-manjaro/.
Try CTRL+F5 to force a cache refresh. The images got updated along with the information about release versions today. Given the time of your post, the updates may have been taking place at that particular moment in time.
Yep, I was definitely seeing the old download page. The new one looks good.