I was previously using Lazy Load on my Post Grid layouts.
I've since disabled it and removed the images. I just noticed that even on the layouts where I've done this, lazy load is still trying to fire. Except without an image, it is showing a broken image link with a "Post Grid Lazy Load" alt text.
When inserting an image, but still having Lazy Load disabled, the image now shows, which is better than a broken image, but seems that this is not functioning correctly.
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it seems cache issue, have you used any cache plugin? please clear browser cache or deactivate cache plugin.
adding a lazy load image should fix the issue.