CMS data vanishes

I am building a website for authors.
Authors can upload books and their profile using form and it is saved in CMS.
I am using pabbly integration for this.
Author CMS saves author’s data and Book CMS saves book data.

And then there are readers.
Readers can follow the author.
This follow button is a form button.
When reader clicks the Follow(form button),
this form sends the reader’s id and author’s id
so Follow CMS saves this data in the reference field.

Issue comes after this action.
Whenever reader follows the author, that certain author’s data from Author CMS are all gone.

There are no connection between integrations and CMS but I cannot understand why this keeps happening.
Could anyone please give me any advices or ideas you can think of?
Thank you in advance.

Here is my public share link: LINK
(how to access public share link)