Map form fields to post meta-fields problem

hi, after I saved my configuration, the mapping of all the fields I configured contains the text “custom_meta_key”. For example: I enter “name” as custom field and select “name [text*]” as form field, save and the page reloads with “custom_meta_key” instead of “name”.

before saving: https://drive.google.com/file/d/1KpWmXFagPT5rTQEKyu7oSfF-C-pRoKIs/view?usp=drive_link

after saving: https://drive.google.com/file/d/1TTpex7i9vOXYyWA8Su3VNQA1HIskX5gQ/view?usp=drive_link

The page I need help with: [log in to see the link]