Problem:
Post Date field doesn't output date format according to Site Language setting.

Solution:
This issue is known to us. The simple workaround to this is, instead of using single field block, you should try to add "Fields and Text" block and then within the fields and text block you should try to add the shortcode to display the post date. For example:

Relevant Documentation:

Problem:

Changing the value of a custom field overwrites all other post-custom fields.

Solution:

Do not add the loop of the posts inside every single post. Instead,

- Go to Toolset > Dashboard.

- Click on the "Create Content Template" button under the Templates column for Manuals to create a single post content template.

- There add whatever content that you need for the single post. Including the title, flag, description, and the custom field.

- Use the view that you created for the list of flags there.

Relevant Documentation:

https://toolset.com/course-lesson/creating-templates-to-display-custom-posts/

https://toolset.com/course-lesson/displaying-related-posts/