Strange space when embedding in a website

Hello all,

With hype, I create web-banner, which is then embedding into a website.
On the website there is a given area, where the banner is placed. So far I had no problems.

But now after a few seconds, there is a strangely space above the web-banner. I can not explain where that comes from.

On the website:

In Hype:

Thanks for help
Sorry for this shit english :smiley:

Hard to say – can you share a zip file and a link to where this appears?