Can't edit posts nor make new posts

Hi i’m having some trouble with my wordpress site. I can’t edit posts and pages. The only thing i can edit is the title. If i edit the story and click ‘Update Post’ or make a new post and click ‘Publish’, the story field is emptied and the whole story is gone. Only the title gets edited/published. The only post that has text on the website is the standard ‘Welcome to WordPress. This is your first post.’ and i can’t even edit that. If i do and click update, any changes i made are gone and the original story is there again.

What is going on? Did i accidentally turn off updating/publishing rights? If so, where can i change this?

Thanks in advance for your help!