Field for email address displays erreneous info

[MicSchep]

In FormBuilder I use a field of type "single line text box" with required data "email address". Users complain about a space appearing automatically in front of the mail address they type. They can't send the form until they remove the space. This is not obvious and people often abandon.
If I remove all spaces in "field value" in the editor, the problem gets worse: the form displays the private mail address of the webmaster as a default! Please advise.

[MicSchep]

It seems the field name "Email" I picked is too general and already in use in the website, referring to the user. Aren't field names constrained to the context of the form?