I have kind of the same issue.
Muse preview and export does not update changed alignment.
It makes the whole program useless.
So, I found the answer. You have to select all the elements, right click, and "Group" them. In the preview it keeps them in line. Don't know why this is necessary but it works.
thanks for the update - unfortunately that does not work for me.
Most design changes do not update in preview or on the server,
also if I 'group' or 'lock' them.
I am not using Muse often, so maybe there is something I am missing.
Especially your screenshots or a link.
I suggest to start a new thread as this thread is set as got the correct answer.