Yikes. Each step in the planning tool is a different "page" thanks to the hash in the url...were you clicking back through a bunch of stages to get off the site?
It does some kind of load/resolve thingy very quickly each time I press back. But nothing happens, still on Dash.
(I'm not sure what the original commenter's platform is though.)
We'll figure out a fix for that. Thanks for the feedback.