Thank you Zak. This part of what you said really helped
"When you do "Preview Site in Browser" within Muse what URL is displayed in your browser? If it's something other than 127.0.0.0 or localhost, and if the devices are on the same wireless network as your computer, then you should be able to enter that URL into the browsers on your devices. The code generated for Preview Site in Browser uses the JavaScript redirect, so if my theory is correct (the out-of-date/incomplete BC device database is the problem) the tablet layout should load on your tablets (and phone layout on any phones you try)."
When I previewed it like this all the redirects worked properly and everything was fine. I then uploaded it to a 3rd party hosting provider and it works as it should.