thousand separator not uniform all over when creating invoice in the isupplier portal

Hi,
Even the user have performed the following setup he still don't have the thousand separator while creating invoice in the isupplier portal:
1) Login to the Application.
   Click on Preference from the HOME page
   Under regional section , Please make sure the Number format is "10,000.00"

2) Please check the profile "Currency:Thousands Separator" . Value has to be Yes

3) Please check the profile "ICX: Numeric characters" . Value has to be "10,000.00"

Once above is done . close the application and re-open the same and retest the issue.

Please advice.

Thanks
Ahmed