We are testing a guest SSID that using web passthrough with “email input” on cisco WiSM2 controllers (running 7.4.110.0). The WLAN settings are:

I am using an uploaded page login-guest.html and overriding the global config as we have another SSID using the default global login.html.
My problem is that when mobile devices connect to the guest SSID, they are redirected to the guest page which asks for an email address. The page also has an Accept button. When the user types in an email address using the popup keyboard if they press “Go” on the popup keyboard rather than pressing Accept on the web page they are taken to the default cisco web page “Welcome to the Cisco Wireless network”.
Is this a bug or is there any way around this ?