When clicked on each individual contact, the larger image is not shown. It appears it is lost in some CSS trick to perhaps hide the location of the file? Not sure but the mini thumbnails all load. You can upload new pics just fine.. but the larger picture for each contact just appears as a grey box. Running wordpress 4.9.11 and php 7.3 in apache 2.
Attached files: Screen Shot 2019-10-23 at 4.01.12 PM.png Screen Shot 2019-10-23 at 4.01.30 PM.png
This is quite possibly another plugin or the theme injecting some styling that's overriding the display of images. Try disabling plugins to see if any of those are interfering and if not, try switching themes briefly to see if that is. Once we know what is interfering we can do something about it.