I have a weird issue, when i want to change the author name from an item and click on it , it does not open the normal pop up but a page in a full view mode open and i can not click on the autor name nothing is happening.

In detail:
I Go to : Items / my article

Then in the : "Author publishing status" tab i click on change ( from the Author name field)
and a window open with all my k2 autor name but i can not click on them?

thank you for your help , i have attached a print screen of the issue

Hello anyone could please help me with this issue?