photos on grid not showing

Hi,

Last night I started encountering problems with my site https://www.lastingrelationship.net/

The featured post photos are not showing except for one. I’m not so sure if I made a mistake along the way or it’s a WP problem. Anyway, when the featured posts are in grid, only 1 photo is showing. But when I use the slider option, 2 photos are shown on the slider. However, the thumbnails for the 2 recent posts aren’t showing as well.

Please help. Thank you very much.