any idea why walls show this way on offline version?
Its probably because you are using Firefox.
Use chrome and that should be fixed.
When I use chrome, index file type is still Firefox HTML document. Don’t know how to change it so I can use chrome
The reason is because your default browser is Firefox which you can change that following the link below:
after opening the tour in the Firefox, copy the URL from your Firefox and paste it into Chrome. That should work.