WTForm validation problem

{% extends "base.html" %}
{% block content %}
<h1>Sign Up</h1>

<div align='center'>
<form method="POST" action="/signup">

{{ form.hidden_tag() }}
<p>{{ form.username() }} *Username</p>
{{ form.username.values }}

<p>{{ form.email() }} *Email</p>

<p>{{ form.password() }} *Password</p>

<p>{{ form.confirm() }} *Confirm Password</p>

<p>Please Accept Terms of Service {{ form.accept_tos() }}</p>
<br/>
<br/>
<button type="Submit" value="submit" name="submit">Submit</button>
</form>
</div>
{% endblock %}