WP Media library interface display error

Hello,
I would like to share here a problem that I have not seen reported elsewhere... When I create a "file" type field to upload images to a post both in backend and in frontend (with the Frontend Admin plugin or with a piece of code taken from your documentation), I have errors that occur: if I activate the "WP Media Library" mode, the WP Media interface on the Admin side is displayed in a completely unstructured way and is therefore unusable. If I disable this mode, the image loading stops at 33% and shows an "Invalid Nonce" error. It seems that implementing the same field in both backend and frontend is having a problem... I tried also with 2 fields with different names and the problem remains the same. If I remove the implementation of the field in frontend then the WP media interface on the backend side becomes correct again.
I want to buy ACF Pro because I need the field repeater but I would like to know how to solve these bugs before investing?
Thank you in advance for your assistance,
Cordially,
Anthony