thank you for your reply.
I have no idea what plugin generate this.I don’t have a folder named xNFeJ7XB2xnaDGdA ,it changes everytime Refresh the page https://www.saleinfo.org/robots.txt
the correct one is:
User-agent: *
Disallow: /wp-admin/
Disallow: /wp-includes/
I cannot remove
User-agent: *
Disallow: /xNFeJ7XB2xnaDGdA
it’s auto generated
anyone have the same problem?