Sorry about this, very strange.
I am not able to replicate this issue with the information provided. And I see submissions coming in. There's be about ten since this issue was reported.
This suggests to me the issue may lie with your environment. Could you test it out with a different machine?
Could I have a bit more information about your system? I'd like to report this issue to the developers that support discourse and this wizard plugin. This is unlikely to resolve your issue quickly, but would probably help many others in future.