adding a host with SNMPv3 only fails

I was trying to add a device that has SNMPv1/2c disabled and SNMPv3 enabled. I do not want any more data about my environment available to non-technical users. When I try to add the device I get the following error:

Hostname: <name of host>
SNMP Version v2 Port blank
Community blank
SNMPv3 Configuration
Auth Level NoAuthNoPriv
Auth User Name <name of user>
Auth Password <password>
Auth Algorithm MD5
Crypto Password <password>
Crypto Algorithm DES

[check] Adding host dsc5 community public port 161
[check] Trying community public ...
[alert] No reply on community public using v2c
[alert] Could not reach dsc5 with given SNMP community using v2c

Devices will be checked for Ping and SNMP reachability before being probed. Only devices with recognised OSes will be added.

Why is it trying to use v2c? I know the SNMPv3 works because I am using it with the OEM management software and with Cacti.