The content of articles in rich text are empty

I have a weird issue.
In our CMS for strapi admin all contents for articles in rich texts fields are empty.
but if I open api for the same article I see the content of reach text field.
I’m not sure why this happened and how to fix it.
hope for your advice.

so, here is a screen of api that we are getting

and here is screenshot of admin panel for the same article

Looks like you’ve solved the issue.

What was the issue that you found? It’s helpful for others.