So I fixed it by re-uploading the images. But I have noticed similar problems popping up elsewhere. The problem- the images load initially after uploading. But after a few hours, the images disappear. Other examples related to @hyperbowler and @tm.tm 's posts:
Did anyone else come across broken, recently uploaded images?
I may ‘restart’ the server but I am not sure what the issue is either. Seems random.