Images not displaying

Guys, first congrats for this fantastic plugin, 
I'd like your help in the following issue
The images on Medium were showing previously, but now they are not visible. Can you let me know if any updates are required?

https://www.wrccdesign.com/articles/

This is the code I'm using:
[display_medium_posts handle="@wrccdesign" display=4 offset=0 total=10 list=true title_tag="h3"]
