Refer to the followings.
This symptom occurs when the auto complete function for the form is enabled.
To remove the characters listed down in the form, refer to the below procedure.
1, Right click on the icon of [Internet Explorer] in desktop, and then click [Properties].
2, Click [Content] tab, and then click [Auto Complete] button.
3, Click [Clear Forms] button.
4, Click [OK] when [Internet Options] dialog box appeared.
5, Click [OK] to close [Internet Options] dialog box, and then restart Windows.