Errors between back- and frontend / backend functionallity
I´m working on this staging-site and particualarly on this page: https://bgw.91a.myftpupload.com/substrate/ and it comes to errors after saving the page in the backend.
I had made a secont "bigger table" saved it, worked on it, saved it again yesterday... and today everythings gone 😱
And now trying to set up products (see red marks on both attached screenshots) there is again a difference between the backend and frontend.
Also the "preview function" and the "import / export" doesn´t work anymore.
I´ve already tried everything from logging out, starting in a fresh browser (with clean cookies and caches), deactivated / reactivated all plugins... updated everything... and nothing helps.
Could you please give me a hand?
I will send you a user and admin acces right away as usual through the contact form on your page.
Looking forward to your help.
Many thanks and best regards,