Fixtures not working for Is Single doctypes

I had done some changes in

  • Selling Settings
  • Buying Settings
  • Stock Settings

This are all Is Single doctype I added this doctypes in fixtures like this

fixtures = [
     "Custom Fields",
     "Selling Settings",
     "Buying Settings",
     "Stock Settings",

After done the

bench --site mysite.localhost export-fixtures

I got all the json file in the fixtures directory

but If again try to setup the Project in different machine. Custom Field working fine but the Selling, Buying and Stock Setiings don’t working. these are all Is Single doctypes. please help