I updated plug-ins on our site, and the post-grid layout is now hosed. Proportional size of image in grid changed, but more critically is that the associated text is now single-character-per-line vertically stacked.
(I have not worked with your post_grid before, and the original implementor is not available)
I did see the request to update at the top of the wordpress page editor after updating, and selected it - resulted in a "...not authorized..." message similar to one mentioned in another ticket. Now that message no longer shows up.
I tried viewing incognito, and in another browser to see if it was a caching issue.
I looked thru the post_grid settings, and experimented with the Layout Settings (height, width, etc) with no impact. In doing so, I updated the post_grid and the page a number of times.
See the "Upcoming Events" on the bottom right of https://napfs.club, and in the right of the below image, with the vertically stacked text below the image. https://imgur.com/a/VHfx1VM