Picture large view shows twice

Hi there,

if you look on my page: https://www.schips-kfz.de/gebrauchtmotorraeder/
and you click on one of the pictures, you will very soon understand the problem I am experiencing.

The pictures show twice, the large view in the foreground is correct, but the distorted picture in the background should not actually appear. I don’t know why this picture appears, neither do I know why it is distorted.

What’s the issue here? Thanks for your help!

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