Corrupted page when insert post grid shortcode

Hello everyone.

When I insert the post grid shortcode in a empty wp page and save changes, page shows post grid fine but, when I back to edit the page a random post content shows on edit screen! The original page content with the previously post grid shortcode inserted is no more avaliable with no reason at all!!!

I have tested this problem few times with same result.

Any idea? Please need help.

Thanks, best regards.

https://ww.wp.xz.cn/plugins/post-grid/