<span><a href="{% url account_signup %}">Sign Up</a></span>
<span><a href="{% url account_login %}">Sign In</a></span>

<span><a href="{% url account_login %}">Volunteer sign in / sign up</a></span>

Unify the sign-in/sign-up link to go to the login page.
Unify the sign-in/sign-up link to go to the login page.