got exactly the same issue on line.
I am using widezine theme.
it worked ……when we first installed the site.
now, it works sometime, but not always.
in particular on a blog post it works when I first post the article
but the customed header disapears if I modify the blog post!
and some pages looks like having the same issue
updated today in 3.3.1, nothing changed
can anybody help?