header bug in 3.4.0 - Joomla! Forum - community, help and support

i installed latest update 3.4.0.
after creating new article found out, there 2 tags in header:
<header>
<h1></h1>
<h1 itemprop="name"> lagerei und umschlag </h1>
</header>
how can remove first h1 tag?
it kills design , functions on homepage.
many help.
best regards katrin

what template using ?
please check template core or can check article html. if using jce editor, can set header tag manually inside article.