I recently upgraded to Muse 2017 and then republished my site via FTP. When I viewed the site on my smartphone, the responsive/adaptive characteristics of the site were off, my mobile navigation and some other elements were not pinned to the top of the browser . I tried to find the element or elements causing the site to react adversely, however, I could not locate the problem. I read some forums and saw others reinstalling the previous versions of Muse and republishing, so I followed suit. Unfortunately, my site was saved under the Muse 2017 format and will not open in Muse 2015.2. So, I'm out of luck.
When will these issues be corrected, I got a client on my *** wondering what is wrong with the website.
Please follow the instructions mentioned in this thread also I encourage you to share your .muse with the team as requested - Muse 2017 pinning issues.