Hey CarolineElisa,
this is indeed a bug in the Visual Composer plugin, thank you for reporting! After some testing and troubleshooting I’ve prepared a fix: please download this archive, unzip it, and upload the resulting file (“vc_posts_grid.php”) into the following directory in your WordPress installation: /wp-content/plugins/js_composer/composer/shortcodes_templates/ – replacing the existing file. Next, download this archive, unzip it, and upload the resulting file (“posts_grid.php”) into the following directory in your WordPress installation: /wp-content/plugins/js_composer/composer/lib/shortcodes/ – replacing the existing file.
Do not hesitate to contact me in case you run into any issues or are uncertain as to how to proceed at any point.
Sincerely,
Andrii / Satori Studio