Unable to display thumbnails inside grid

I'm trying to display thumbnails in a simple grid from a json feed using a public s3 TVYouFeed.json file. I'm linking the zip file that I'm side loading to test this. The 4 images are showing properly outside the grid but not inside. I can't figure out what I'm doing wrong. Please help! 

Link for zip file - https://tvyou-media.s3.us-east-1.amazonaws.com/users/ramanarora781%40gmail.com/uploads/Baseline_V4.zip