Hello, we've been using post grid for a while now and it's been working great. A few days ago the posts changed from being 4 across to being one after another. We are also now getting a console error that is referencing post grid. I'm pretty sure this is whats causing the grid layout to look different.
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this issue is happening when wpautop enabled and p tags injected to scripts. you can add the following code to your theme functions.php file to fix the issue.
remove_filter( 'the_content', 'wpautop' );
Let me know the result.