Comfy theme thumbnails not showing up

I am using comfy theme for my website https://www.khojibaba.com but the problem is that i am not getting any thumbnails of the post when i add the images from an online source like when i click add media and choose upload from url or when the images are from an online source the thumbnails are not shown and when i save the image to my pc and then upload it then i can see the thumbnails

Please Help me.

Regards