Form submission redirects to domain.com/contact-us/#wpcf7-f72-

The form is in a widget on the “contact-us” page. When I fill out the form, instead of being returned to the “contact-us” page, with a “success” or “error” message, I am redirected to
domain.com/contact-us/#wpcf7-f72-p30-o1 and get a “page not found” error. What did I do wrong?

I have a very simple form as follows:
<label>Name (required)
[text* name] </label>

<label> Email (required)
[email* email] </label>
<label>Phone (required)
[tel* tel-472] </label>

<label> Subject
[text subject] </label>

<label> Message
[textarea message] </label>

[submit “Send”]
with email instructions as follows:
to:myemail@domain.com
from: <info@domain.com>
subject: Company Name
message body:[messge]
subject: [subject]
tel: [tel-472]