syncsarl
You're using JA Blockk template so you should override this module in folder of JA Blockk template:
/ja_blockk/html/mod_jacontentlisting/
As I can see that you added to html folder of Beez3 template and of course, the thumbnails of modal will not show up. I just renamed this folder in Beez3 template and thumbnails are showing now.
Kindly check.