Responsive ads too narrow, overlapping

Hi,

I've recently started to work with responsive ads, but there is a problem with the way the ad is displayed(see attached file). If I place the adsense tag above some text it will overflow over the text. In the attached picture I placed it at the end so that it does not overlap the other elements in the page.

I'm using this line to display the ad:
[adsense:responsive:xxxxxxxxxxxxxxx]

and when I'm logged in as an admin I get the nice window saying that it's a responsive ad... everything is fine, but in non-admin mode the text of the ad is too narrow, even though all the container of the ad (including the first divs that are generated by adsense not my divs) have a much wider size.

I think this is a bug just because if I place at the same place the whole Google adsense code:

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script><!-- LeaderBoardHeaderResponsive --><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-yyyyyyyyyyyyyyyy" data-ad-slot="xxxxxxxxxxxxx" data-ad-format="auto"></ins> <script>(adsbygoogle = window.adsbygoogle || []).push({});</script>

the normal adsene tag works: [adsense:728x90:xxxxxxxxxxxxxxxxx]

I can pm you with the link to my website for further investigations if needed.

Thanks