Issues with version 2.3.20 and 2.3.21

Hi,

We are experiencing issues with versions 20 and 21 on our websites. Suddenly, on several pages where we use the Post Grid shortcode, the posts are displayed at the bottom of the page instead of in their intended position. When we roll back to version 19, the issue is resolved.

Could you please look into this problem for us?
Thank you.