Looks like a flaw in the AnyConnect interface which is not allowing users to manually select the group from the dropdownlist.

Only workaround at this time:
1 Downgrade the client to 3.1.04059
2 Edit the XML file in C:\Users\%name%\AppData\Local\Cisco\Cisco AnyConnect Secure Mobility Client\preferences.xml to the group wanted


3 Initiate the session via the web interface while picking the group wanted

I see a few individuals having the same issue in this thread – https://supportforums.cisco.com/message/4163865

Hopefully Cisco will provide an AnyConnect client update soon.